[5] He transferred to the University of Connecticut Huskies in 2020, but was denied a waiver and had to sit out his junior season, which wound up being cancelled anyway by the COVID-19 pandemic.

[5] Casparius was selected by the Los Angeles Dodgers in the fifth round of the 2021 Major League Baseball draft,[7] and signed for a $247,500 bonus on July 26.

[8] Casparius spent his first professional season with the Arizona Complex League Dodgers and Rancho Cucamonga Quakes, pitching in five games and allowing two earned runs in six innings.

[17] He did pitch 4+1⁄3 scoreless innings in the National League Championship Series, picking up the win in the clinching sixth game.

[19] In the 2024 World Series against the New York Yankees, Casparius started the fourth game, allowing one run on one hit and three walks in two innings.