Gable Steveson -- one of the top heavyweight college wrestlers in the country -- was arrested Saturday for criminal sexual conduct ... and he's still in custody.
Steveson is a superstar wrestler at the University of Minnesota -- where he just wrapped up his freshman year with an incredible 35-2 record ... finishing as the #3 ranked heavyweight in the country.
But now he's in huge trouble ... the 19-year-old was arrested at his Minneapolis home on Saturday after a person told police Steveson and another UM wrestler committed sexual assault with an object on Friday.