In 2016, Stiever's freshman year at Indiana, he made 18 appearances (four starts), going 1–1 with a 2.47 ERA while striking out thirty over forty innings of work.

[8] After the season, he was selected by the Chicago White Sox in the fifth round of the 2018 Major League Baseball draft.

[9] Stiever signed with the White Sox and made his professional debut with the Great Falls Voyagers, going 0–1 with a 4.18 ERA over 13 starts.

[14] Stiever was called up to the major leagues on September 13, 2020, and started against the Detroit Tigers that same day.

[17] Over 17 starts with Charlotte, Stiever went 5-5 with a 5.84 ERA and 88 strikeouts over 74 innings; he underwent surgery on his latissimus dorsi muscle in August, ending his season prematurely.