Mackenzie "Mack" Beggs, 18, is being hailed as a transgender hero by LGBT advocates after defeating Chelsea Sanchez on Saturday in the Texas Girls' Class 6 A 110-pound division championship for the second year in a row.
The win was bittersweet, however, as vicious booing filled the arena after the final pin.
A few years ago, Beggs began his transition from female to male.
It was his steroid therapy treatments while wrestling girls that stirred a fierce debate about competitive fairness and transgender rights last season.
Speaking to Dallas Morning News, Beggs explained "That (the criticism) didn't stop me from competing". This year I wanted to prove a point that anyone can do anything.
Last season, Beggs also defeated Sanchez, 12-1, in the girls Class 6A championship a year ago.
His mother, Angela McNew, added: "He has so much respect for all the girls he wrestles". "They're saying, 'steroids.' They're saying, 'Oh, they're beating up on girls, '" he said.
"Even though I was put in this position, even though I didn't want to be put in this position, even though I wanted to wrestle the guys, I still had to wrestle the girls", she said.
Many parents have been outraged to see their daughters wrestling someone who, effectively, has the strength of a young man.
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Fans had mix reactions, and a loud chorus of boos could be heard when Beggs was named the state champion.
A UIL policy also says that student-athletes in high school must compete as the gender that's on their birth certificate.
It's really, really hard", he told the Morning News, "but I'll do it.
The teen came under scrutiny previous year when a parent tried to stop him from wrestling in the female division by filing a lawsuit arguing that Beggs' use of testosterone during his transition gave him a competitive advantage, USA Today reported. The birth certificate rule was approved in 2016 by the University Interscholastic League, the governing body for Texas high school sports.
Beggs' road to the championship last season included two forfeits in the regional tournament by wrestlers who feared injury.
Despite all the backlash, Beggs entered the ring and capped a flawless 36-0 season.
Beggs' family has repeatedly said he wants to wrestle boys.
Beggs beat three female wrestlers en route to his state title, at least one of whom has said she doesn't think it's fair that Beggs gets to wrestle in the girls' division.
Beggs was born a girl.