Petrasek attended Northport High School, which he led to the 2013 Long Island Class AA Championship.

[1] Petrasek immediately entered the starting lineup for Columbia and named was named Ivy League rookie of the week after scoring 20 points and blocking three shots in an 82–59 win over Fairleigh Dickinson on December 21, 2013.

[3] Shooting 11-for-14 from the floor, Petrasek scored a career-high 31 points to lead Columbia to a 79–75 win over Cornell on January 20, 2017.

[10] On July 13, 2020, he has signed with Nizhny Novgorod of the VTB United League.

[10] On June 30, 2021, he has signed with Anwil Włocławek of the Polish Basketball League.