Lia Thomas took control in the final 100 yards of the 500-yard freestyle to make history Thursday as the first transgender woman to win an NCAA swimming championship.

Thomas, the University of Pennsylvania senior who entered the NCAA women’s swimming and diving championships as the top seed, had a season-best time of 4 minutes, 33.24 seconds at Georgia Tech’s McAuley Aquatic Center.

“I didn’t have a whole lot of expectation for this meet,” said Thomas, a former male swimmer for Penn State. “I was just happy to be here and race and compete the best I could.”

The inclusion of the transgender swimmer created controversy, even within the sport. There were fewer than 10 protesters outside the Georgia Tech facility, and some carried banners which read “Save Women’s Sports” in the stands.

“I try to ignore it as much as I can,” Thomas said. “I try to focus on my swimming .. and just try to block out everything else.”

University of Pennsylvania transgender athlete Lia Thomas perares for a preliminary heat of the 500 meter freestyle at the NCAA Swimming and Diving Championships Thursday, March 17, 2022, at Georgia Tech in Atlanta. (AP Photo/John Bazemore)

Credit: John Bazemore/AP

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Credit: John Bazemore/AP

Virginia’s Emma Weyant was second at 4:34.99.

The race was close until the final 100 yards, with Weyant and Erica Sullivan of Texas pushing Thomas for the lead. The three swam in lanes three through five, adding to the drama, with Thomas in the middle.

As was the case in Thursday morning in a preliminary win, Thomas was stronger at the end. She won the preliminary race at 4:33.82.

Pennsylvania's Lia Thomas smiles after winning a preliminary heat in the 500-yard freestyle at the NCAA women's swimming and diving championships Thursday, March 17, 2022, in at Georgia Tech in Atlanta. (AP Photo/John Bazemore)

Credit: AP

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Credit: AP

Sullivan was third at 4:35.92. Stanford's Brooke Forde was fourth at 4:36.18.

Thomas has followed NCAA and Ivy League rules since she began her transition in 2019 by starting hormone replacement therapy.

Thomas spoke with ESPN immediately after the race but would not participate in the official news conference, as required by the NCAA. Since participation is required, possible action could come following evaluation by the NCAA’s swimming and diving championships committee.

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