Mueller often appeared to be reading documents while Swift watched the proceedings closely, occasionally conferring with her counsel.
Swift's fans and supporters are hailing her for speaking out against the incident.
The radio station fired Mueller two days after the incident for violating the morality clause of his contract, court documents show. He recalled being kicked out of Swift's concert by her tour manager.
The deejay, David Mueller, has sued Taylor, saying her accusation that he groped her during a meet-and-greet in 2013 is false and caused him to lose his job. According to People, Swift and Mueller were both in attendance but did not acknowledge one another.
The former radio host who was sacked for allegedly inappropriately touching pop star Taylor Swift is only suing her for money and fame, Swift's attorney said Tuesday in opening statements of their civil trial. During Monday's jury selection, Swift was seen wearing a black jacket and white top, with pulled-back hair.
There will be no alternates.
Mueller and his witnesses will be first to take the stand and be cross-examined after opening statements.
They must be present for the rest of the trial.
David Mueller, a host on a Denver country radio show, was posing for a photo with Swift and his girlfriend at meet-and-greet event ahead of a Swift show on June 2, 2013, when the alleged groping happened. He is seeking unspecified damages.
Swift, 27, is expected to testify in detail about the alleged sexual assault - which was captured in a photo that's set to be key evidence in the case. She says she wants to hold Mueller accountable and is seeking $1.
One man who ultimately was not selected told U.S. District Judge William Martinez on Tuesday that he was not necessarily a fan, "but her music is catchy and it's good vibes".
Venezuela crushes small anti-Maduro uprising at military base
Former Foreign Minister Delcy Rodriguez was elected President of the Constituent Assembly. Others said they heard the sound of loud patriotic singing at the military base.
He claims he was sacked after Swift falsely accused him of grabbing her and he is seeking up to $3 million in damages.
But he was sacked on 4 June, 2013, two days after the alleged incident.
Jury selection began on Monday and continued into Tuesday. "Swift's photographer and (her) highly trained security personnel.is nonsense".
A man talks a photo of the sign outside Alfred A. Arraj Courthouse on August 7, 2017 in Denver.
"Taylor is aware that her defiance in fighting against these allegations - not only made toward her but other artists and colleagues - will achieve global visibility around sexual assault issues that, in many cases, go unreported and ignored and are marginalized", Britto said.
Here is a brief rundown of the claims and counter-claims.
Both Swift and Mueller are expected to testify personally.
There will be 32 seats open to the public within the courtroom.
Swift maintains she was sexually assaulted, but she was trying to keep the matter discreet and quiet. She told her security team, who removed Mueller from the gig.
Swift claimed in a countersuit obtained by ABC News that Mueller "took his hand and put it up my dress" during the publicity event, and it "was not an accident".