Beggs, who began transitioning from female to male a few years ago, wrestles in the girls' division under University Interscholastic League rules, which mandate that athletes compete as the gender listed on their birth certificate, according to the Morning News' SportsDay.
18-year-old Mack Beggs, who is a a senior at Euless Trinity High School just north of Arlington, Texas, entered the state tournament last week with a ideal record.
His mom, Angela McNew, said that Beggs isn't trying taking advantage of the girls he is forced to wrestle simply to have an easier path to a state title.
Cheers and boos greeted the judges' decision but it confirmed what everybody already knew about Mack Beggs: he is by far the best in his girls' wrestling weight class in Texas.
Beggs wants to wrestle boys and said he would if that law didn't exist. "It has more to do with skill and discipline than strength".
Many states, along with the NCAA, allow athletes to compete based on gender identity, rather than birth gender.
"Embracing transgender ideology in sports requires that we embrace cheating through doping", she said.
Beggs defeated Chelsea Sanchez of Katy Morton Ranch High School.
Avoiding much of the anticipated backlash for receiving special treatment and being allowed to take performance-altering drugs was part of the controversial high school wrestler's plan this year.More news: Newcastle 2 - Bournemouth 2: Gosling salvages point for Cherries in relegation battle
Beggs has compiled a 132-9 record over the last three seasons, and hasn't lost a match in the past two years.
"It definitely felt different", he told The Dallas Morning News about winning on Saturday.
"It just comes down to technique and who has the most heart".
This season, Beggs has gone 36-0 with just one forfeit and no lawsuits.
"I wanted to come out on top, and in my heart-I feel like a champion", Beggs said.
A senior at Euless Trinity High School near Dallas, Beggs anticipates competing against boys when she goes to college in the fall. It transformed his physical appearance and added muscle mass.
You may remember Beggs's story, past year he was the focus of a huge controversy regarding him wrestling in the girls' division.
Beggs is now entertaining a scholarship offer at an out-of-state school.
Last year, the 18-year-old beat Sanchez for the championship. "This is what I worked for".