[4][5] In 2016, Korsak attended the Prokick Australia camp held by Nathan Chapman, and his performance there led to an athletic scholarship offer to play American football at Rutgers University in the U.S., which he accepted.

[2][6] Korsak had played Madden NFL 06, watched several Cleveland Browns games and the film Any Given Sunday to learn the rules of the sport.

[8] He started all 12 games that year, being named honorable mention all-conference while posting a team-record with a 40.1 net punt average.

[11] He appeared in every game and posted a total of 76 punts for 3,327 yards, having a long of 69 with only two touchbacks and 31 kicks inside the 20, while ranking first in the Big Ten Conference with a net average of 41.5.

[11][13] Korsak appeared in all nine games during the 2020 season (which was shortened due to the COVID-19 pandemic), posting 48 punts for 2,062 yards (a gross average of 43.0), including a long of 66 with no touchbacks and 21 inside the 20-yard line.

[1] He was named second-team All-American, first-team all-conference, a finalist for the Ray Guy Award and Rutgers' most valuable player after posting 72 kicks for 3,299 yards.

Korsak played in all 18 regular season games in 2023, where he punted 117 times with a 47.9–yard average and had six singles and two special teams tackles.