WATT, J.
{1 We granted certiorari to. consider a single issue.
The first impression question presented is: whether, in a suit for breach of contract in which a party seeks compensation for an expert witness's failure to provide competent litigation support services in an underlying suit, the cause must be proven by the presentation of expert testimony.
{2 We emphasize that this matter is grounded on a claim for breach of contract. In so doing, we also stress that this opinion does not stand for the proposition that a losing party may recover monies paid to an expert witness for the formulation and presentation of a professional opinion in the context of litigation merely because the party requesting such opinion did not prevail or recover to the extent anticipated. Nevertheless, we determine that, under the unique facts of this cause, expert testimony demonstrating that Campbell's performance in the underlying litigation was substandard was unnecessary. - Campbell's own admissions were sufficient to infer negligence. Furthermore, there was additional, supporting testimony indicating that Campbell did not present an accurate document which could be empirically supported or shown to comply with governmental standards. The testimony presented was most certainly such that a lay person, through common knowledge or experience, could determine that Campbell did not produce the very thing for which the Ellisons' contracted, a supportable expert opinion concerning the state of the groundwater underlying the Ellisons' property and the source of its pollution.
Finally, Campbell's contradictory statements made at the time of his deposition and at trial were suffi
cient that a reasonable juror might well question his veracity.
FACTS AND PROCEDURAL HISTORY
T 3 On April 29, 1999, the Ellisons filed suit in Canadian County against an oilfield waste disposal facility alleging it was responsible for polluting the groundwater on their property. The Ellisons believed that the polluted ground water explained the deaths of cattle grazing on their property and drinking from its streams. They hired Campbell, an expert hydrogeologist,
in January of 2001 to conduct tests and to drill monitoring wells to establish empirical data which would allow him to render a scientifically supportable expert opinion to confirm their suspicions and provide support for their suit.
T4 Campbell recommended that several monitoring wells be drilled on the Ellisons' property to provide groundwater samples for pollution measurements. In an attempt to control litigation costs, the Ellisons agreed to the drilling of two monitoring wells. Samples were collected from the wells for a period of several years while a partial summary judgment in the cause was considered on appeal. At the request of the Ellisons, Campbell prepared his expert report and presented it to the defendants in the Canadian County cause in September of 2006.
T5 On December 4, 2006, Campbell appeared for his deposition. The defendants grilled the expert witness over a three-day period. During that time, Campbell testified that he did not know whether certain protocols were followed in sample testing
He also pointed out errors in the report he submitted to the defense prior to his deposition, including the utilization of a value of 4,000 cubic feet in a calculation when it should have been 8,000 cubic feet
When asked if he thoroughly researched industry knowledge in regard to mud pits and their relationship to leakage and pollution, Campbell responded that it was "difficult to say" and that "serendipity has a lot to do with finding articles when you need them."
16 At the end of the first day of his deposition testimony, Campbell was asked to verify some of his calculations and to check errors in his written report. When asked about these items the next morning, Campbell told counsel: he "was too tired" to go over his report; he was "a busy person;" he knew the report contained misplaced bars on graphs, questionable concentrations, and the only way to be certain that all the charts in his materials were not riddled with errors
would be to go back and look at them.
Initially, when asked if the monitoring wells complied with Oklahoma Water Resources Board and Environmental Protection Act standards, Campbell testified he "didn't know" because he hadn't read them and that the Environmental Protection Agency would not accept his data as reliable.
T7 Shortly after Campbell's deposition concluded on December 6, 2006, Campbell discontinued his assistance in the Canadian County litigation. While Campbell insists this occurred because he was fired, the Elli-sons contend Campbell quit The plaintiffs/appellees' allegation was supported by testimony presented at trial.
18 The Ellisons settled the Canadian County matter in January of 2007. In July of the same year, they filed their petition in Oklahoma County in the instant cause alleging negligence, tortious breach of contract, and breach of contract for the expert witness's failure to provide them with a scientifically supportable product which could be utilized in the Canadian County suit. The Ellisons sought actual and consequential damages. Campbell moved to dismiss the cause arguing that the Ellisons had not stated a claim upon which relief could be granted and that the claim sounded in contract rather than in tort. The trial court agreed in part, finding that the Ellisons' cause should proceed as a simple breach of contract case. Campbell counterclaimed arguing that he was owed some $34,758.50 for services rendered, together with prejudgment interest, reasonable attorney's fees, and costs.
1 9 The jury heard testimony in the instant cause over a four-day period, February 8th through the lith, 2010. On March 11, 2010, based on the jury's verdict in the Ellisons' favor, the trial court entered judgment for the plaintiffs/appellees in the sum of $408,748.68,
plus statutory interest. Campbell timely filed a motion for new trial or, in the alternative, a motion for judgment notwithstanding the verdiet. Campbell argued that the Ellisons' claim for breach of contract failed because they did not present an expert in hydrogeology to counter his scientific conclusions. Unconvineed, the trial court denied the motions.
{10 Campbell appealed. In an unpublished opinion, the Court of Civil Appeals reversed the trial court on September 6, 2018. It determined that the trial court committed error by failing to require the Ellisons to present an expert to refute Campbell's testimony for the purpose of establishing that his actions in the underlying cause amounted to a breach of contract.
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WATT, J.
{1 We granted certiorari to. consider a single issue.
The first impression question presented is: whether, in a suit for breach of contract in which a party seeks compensation for an expert witness's failure to provide competent litigation support services in an underlying suit, the cause must be proven by the presentation of expert testimony.
{2 We emphasize that this matter is grounded on a claim for breach of contract. In so doing, we also stress that this opinion does not stand for the proposition that a losing party may recover monies paid to an expert witness for the formulation and presentation of a professional opinion in the context of litigation merely because the party requesting such opinion did not prevail or recover to the extent anticipated. Nevertheless, we determine that, under the unique facts of this cause, expert testimony demonstrating that Campbell's performance in the underlying litigation was substandard was unnecessary. - Campbell's own admissions were sufficient to infer negligence. Furthermore, there was additional, supporting testimony indicating that Campbell did not present an accurate document which could be empirically supported or shown to comply with governmental standards. The testimony presented was most certainly such that a lay person, through common knowledge or experience, could determine that Campbell did not produce the very thing for which the Ellisons' contracted, a supportable expert opinion concerning the state of the groundwater underlying the Ellisons' property and the source of its pollution.
Finally, Campbell's contradictory statements made at the time of his deposition and at trial were suffi
cient that a reasonable juror might well question his veracity.
FACTS AND PROCEDURAL HISTORY
T 3 On April 29, 1999, the Ellisons filed suit in Canadian County against an oilfield waste disposal facility alleging it was responsible for polluting the groundwater on their property. The Ellisons believed that the polluted ground water explained the deaths of cattle grazing on their property and drinking from its streams. They hired Campbell, an expert hydrogeologist,
in January of 2001 to conduct tests and to drill monitoring wells to establish empirical data which would allow him to render a scientifically supportable expert opinion to confirm their suspicions and provide support for their suit.
T4 Campbell recommended that several monitoring wells be drilled on the Ellisons' property to provide groundwater samples for pollution measurements. In an attempt to control litigation costs, the Ellisons agreed to the drilling of two monitoring wells. Samples were collected from the wells for a period of several years while a partial summary judgment in the cause was considered on appeal. At the request of the Ellisons, Campbell prepared his expert report and presented it to the defendants in the Canadian County cause in September of 2006.
T5 On December 4, 2006, Campbell appeared for his deposition. The defendants grilled the expert witness over a three-day period. During that time, Campbell testified that he did not know whether certain protocols were followed in sample testing
He also pointed out errors in the report he submitted to the defense prior to his deposition, including the utilization of a value of 4,000 cubic feet in a calculation when it should have been 8,000 cubic feet
When asked if he thoroughly researched industry knowledge in regard to mud pits and their relationship to leakage and pollution, Campbell responded that it was "difficult to say" and that "serendipity has a lot to do with finding articles when you need them."
16 At the end of the first day of his deposition testimony, Campbell was asked to verify some of his calculations and to check errors in his written report. When asked about these items the next morning, Campbell told counsel: he "was too tired" to go over his report; he was "a busy person;" he knew the report contained misplaced bars on graphs, questionable concentrations, and the only way to be certain that all the charts in his materials were not riddled with errors
would be to go back and look at them.
Initially, when asked if the monitoring wells complied with Oklahoma Water Resources Board and Environmental Protection Act standards, Campbell testified he "didn't know" because he hadn't read them and that the Environmental Protection Agency would not accept his data as reliable.
T7 Shortly after Campbell's deposition concluded on December 6, 2006, Campbell discontinued his assistance in the Canadian County litigation. While Campbell insists this occurred because he was fired, the Elli-sons contend Campbell quit The plaintiffs/appellees' allegation was supported by testimony presented at trial.
18 The Ellisons settled the Canadian County matter in January of 2007. In July of the same year, they filed their petition in Oklahoma County in the instant cause alleging negligence, tortious breach of contract, and breach of contract for the expert witness's failure to provide them with a scientifically supportable product which could be utilized in the Canadian County suit. The Ellisons sought actual and consequential damages. Campbell moved to dismiss the cause arguing that the Ellisons had not stated a claim upon which relief could be granted and that the claim sounded in contract rather than in tort. The trial court agreed in part, finding that the Ellisons' cause should proceed as a simple breach of contract case. Campbell counterclaimed arguing that he was owed some $34,758.50 for services rendered, together with prejudgment interest, reasonable attorney's fees, and costs.
1 9 The jury heard testimony in the instant cause over a four-day period, February 8th through the lith, 2010. On March 11, 2010, based on the jury's verdict in the Ellisons' favor, the trial court entered judgment for the plaintiffs/appellees in the sum of $408,748.68,
plus statutory interest. Campbell timely filed a motion for new trial or, in the alternative, a motion for judgment notwithstanding the verdiet. Campbell argued that the Ellisons' claim for breach of contract failed because they did not present an expert in hydrogeology to counter his scientific conclusions. Unconvineed, the trial court denied the motions.
{10 Campbell appealed. In an unpublished opinion, the Court of Civil Appeals reversed the trial court on September 6, 2018. It determined that the trial court committed error by failing to require the Ellisons to present an expert to refute Campbell's testimony for the purpose of establishing that his actions in the underlying cause amounted to a breach of contract.
§11 On September 26, 2018, the Ellisons filed their petition for certiorari with this Court. The petition was granted on December 3, 2018. We received the record on the 9th. On January 6, 2014, a new attorney filed an entry of appearance on Campbell's behalf.
Standard of Review
a) Denial of new trial.
12 Upon review of a motion for a new trial where the trial judge presided at the trial, heard the testimony, observed the witnesses, and had full knowledge of the proceedings, it is well settled that our standard of review is one of abuse of discretion.
This Court recognizes that the original adju
dicator is in the best position to know whether substantial justice has been done.
The strength of the showing for error or abuse of discretion is much less when the trial court refuses to grant a new trial than when such a motion is sustained.
b) Judgment notwithstanding the verdict.
€18 In ruling on a motion for judgment notwithstanding the verdict, the trial judge considers all evidence favorable to the nonmoving party and disregards all evidence favorable to the movant. We apply the same standard on review of the trial judge's decision.
c) Jury Verdict.
114 We must affirm a jury verdict if there is any competent evidence reasonably tending to support it, evidence which is relevant and material to the issue to be determined.
It is not for us to weigh the evidence. We consider all the evidence tending to support the verdict, together with every reasonable inference from it. We must affirm unless there is an entire absence of proof on a material issue.
A jury verdict is conclusive as to all disputed facts and all conflicting statements, where there is any competent evidence tending to support the jury verdict. Where a jury has tried a cause, it is the exclusive arbiter of the credibility of the witnesses.
d) Necessity of producing expert testimony.
115 Expert testimony is ordinarily necessary to establish causation in professional negligence cases.
Nevertheless, an expert is not required if the element of damage lies within the common knowledge of lay persons.
116 Campbell's admissions were sufficient to demonstrate his substandard performance in preparing expert materials in the underlying litigation. Additional testimony confirmed that Campbell did not prepare an accurate document which could be empirically supported or shown to comply with governmental standards. Campbell's contradictory statements were sufficient to cause a reasonable juror to question his veracity. Under these unique facts, it was unnecessary for the Ellisons to present an expert witness. The average, lay person could most certainly conclude that Campbell had not performed the preparations necessary to produce a viable product for the purpose of demonstrating the existence and source of groundwater pollution in the Canadian County proceedings.
117 It is uncontested that Campbell and the Ellisons had an agreement for Campbell to provide hydrogeological services to support claims of pollution in the Canadian County litigation. Although Campbell prepared a report and gave his deposition in that cause, the Ellisons contend that he breached the contract by presenting an opinion which was scientifically unsupportable and of no benefit in the underlying suit. Campbell's primary argument is that the El-lisons were required to present an expert witness to refute his testimony and to establish that he breached the terms of his contract in the Canadian County litigation. Under the unique facts presented, we disagree with the expert witness's contentions.
{ 18 The opposition in the Canadian County case took Campbell's pretrial deposition. Early on in the deposition, Campbell admitted that he did not know the reliability of some of his soil-testing results
and that his report contained a number of typographical errors. There was testimony that, after the deposition, Campbell admitted he would not pass a challenge at trial
Again, Campbell vacillated on the stand and may have caused the jury to question his honesty concerning certain conversations that took place in the underlying cause, i¢.
Campbell admitted that he had been wrong when he initially testified that certain conversations did not take place.
There was also credible evidence that even before his deposition in the Canadian County matter was transcribed, Campbell quit without completing his contractual duties.
{19 At trial, the first witness called was Brad Gungoll (Gungoll), one of several attorneys representing the oilfield waste disposal facility in the Canadian County litigation. He testified that, in presenting an expert's report to laymen, one who had prepared a report which was attentive to detail was more likely to have credibility with the jurors than one which was riddled with typographic errors.
Gungoll went on to state that, in the Canadian County litigation, Campbell did not present himself as an expert "attentive to detail." The witness pointed out that: there were a number of typographical errors in the report; the expert witness was unable to back up the elements of his report; when Campbell's deposition was taken, the plaintiff's case was "basically over;" and Campbell essentially abandoned some aspects of his own report, making it impossible for the Ellisons to rehabilitate him as a credible witness.
120 On cross-examination, Gungoll was asked to demonstrate where or how Campbell's report was deficient. In response, he
pointed out that much of the expected background data was not collected and that it would be impossible to verify test results because water could not be drawn from the monitoring wells, perhaps because they were not properly completed.
Most notably, Gungoll stated that, by the time Campbell's deposition concluded, the Ellisons' case "for all intents and purposes, was in serious trouble
and that there was nothing which could have been done to rehabilitate their witness.
{121 At least one of the attorneys in the underlying litigation testified that Campbell had admitted to him that he could not support the data contained in his reports
and that the information Campbell did ultimately present "was incredible, not to be believed."
The same individual stated that Campbell admitted not following the protocols set by the Environmental Protection Agency or the Oklahoma Water Resources Board in drilling the monitoring wells.
When Campbell was called to testify, he denied admitting that the wells had been "fouled up" but admitted remembering his deposition testimony essentially confirming that such was the case.
122 The plaintiffs/appellees did not call an expert to testify concerning the opinions offered by Campbell as a hydrogeologist in the underlying cause. Nevertheless, the jury heard ample testimony, easily understood by any lay person, demonstrating the shortcomings in Campbell's work in the Canadian County litigation. - Furthermore, Campbell's testimony, in and of itself, presents sufficient evidence from which the jury could have determined that the report he submitted was not what the Ellisons had bargained for when he was hired as an expert in the Canadian County matter. Finally, there was testimony confirming that even Campbell willingly acknowledged his own shortcomings in preparing the report for litigation purposes. Under these unique facts, it was unnecessary that the Ellisons present expert testimony by another hydrogeologist
to counter Campbell's conclusions in the underlying litigation. Furthermore, we determine that the trial court did not abuse its discretion in denying the request for a new trial or judgment notwithstanding the verdict.
CONCLUSION
T23 This opinion should not be read for the proposition that a losing party may recover monies paid to an expert witness for the formulation and presentation of an opinion in the context of litigation merely because the party requesting such opinion did not prevail or recover to the extent anticipated. Rather, here, we are faced with a unique set of cireumstances. An individual held himself out as an expert in hydrogeology capable of preparing a scientifically supportable report in that field. He contracted with the Elli-sons to prepare such a document and be available to support it with his testimony. Instead, he produced a report which was admittedly error-riddled and based upon methodologies not meeting either state or federal regulations. Simply, Campbell did not perform the services for which the Elli-sons contracted and paid.
€24 The cause was tried to a jury. It heard evidence competent to support its verdict. Whether we agree or disagree with the outcome is immaterial. It is not for this Court to second-guess such a verdict. Therefore, we affirm both the trial court's denial of a new trial and motion for judgment notwithstanding the verdict.
COLBERT, C.J., REIF, V.C.J., KAUGER, WATT, WINCHESTER, EDMONDSON, TAYLOR, COMBS, JJ., CONCUR.
GURICH, J., RECUSED.