Tuesday's cross-examinations revealed that Swift and Mueller have starkly contrasting accounts of the incident, and that Mueller's own hurt feelings-both in the moments leading up to the alleged assault and after he was sacked by his radio station-may be central to the case presented by Swift's team.
"This was an assault and Ms Swift reported that it happened".
Mueller, who has denied Taylor Swift's claims, told the jury yesterday during his testimony that he was "100 percent clear" with his managers that he did not grope the pop star.
In a deposition past year, Swift said, "He reached up under my skirt and grabbed my ass right when I was having to pose for the photo, and it felt intentional that that would be the time he would choose to do it".
As Mueller described his career history in detail, starting from high school graduation, one teen stared at her hand, slowly moving each finger.
Dent and Simbeck are listed as possible witnesses at the trial.
The case is another variation on the "he said-she said" nature of high-profile sexual assault allegations.
Fans wait in line to attend the civil case for Taylor Swift vs David Mueller.
Mueller's attorney, Gabriel McFarland, opened his case by showing the eight-member jury a picture from the photo shoot in question and said his client's hand was not under Swift's skirt.
Her lawyer said in his opening statement at the court in Denver, Colorado, that Mr Mueller had "grabbed her rear end". "I felt what appeared to be a ribcage or ribs".
During his attorney's questioning, Mueller said that he and the "Shake It Off" singer were trying to reach around each other during the photo op when "our hands touched and our arms touched", adding that he "may have touched Swift's rib cage, or rib, or ribs", according to the Associated Press.
Wednesday's court proceedings were delayed by a closed evidentiary hearing that lasted almost two hours. At the time, Mueller was a host for the 98.5 KYGO-FM morning show.
Potential jurors were asked whether they or relatives had ever been inappropriately touched or wrongfully accused of groping someone; and whether they were fans of Swift. He is seeking $3 million in damages. Baldridge told jurors in his opening statement that Swift is "absolutely certain" she was sexually assaulted by Mueller, and the photo is "damning" proof of it.
A trial over both lawsuits began this week. Jurors, spectators and the news media were told to leave the courtroom.
Mueller is a former radio show host.
During Tuesday's trial proceedings, Baldridge placed into evidence a document containing notes that Mueller took during a phone call with his talent agent, Heather Cohen, executive vice president of The Weiss Agency.
Mueller took the stand Tuesday, saying a recording of him discussing the incident with his superiors at the radio station was accidentally destroyed when he spilled coffee on his laptop. In court Tuesday, Swift wore a black-and-white checked dress with a collar and black tights and carried a beige handbag. "It's not ruffled, rumpled, affected in any form or fashion", McFarland said.
The country and western DJ is suing Swift for at least $3m (£2.3m) in order to clear his name and recover lost earnings.