Kruczynski made only three appearances as a freshman in 2014, but in 2015, as a sophomore, led the team with 16 starts in which he posted an 8–4 record with a 3.17 ERA.[5] As a junior in 2016, he pitched to an 8–1 record with a 2.01 ERA in 17 starts.[6] In 2017, as a senior for the Pirates, he suffered a broken leg and only made ten starts in which he compiled a 4–3 record with a 4.47 ERA.[7] After the season, he was drafted by the St. Louis Cardinals in the ninth round of the 2017 MLB draft.[8] He signed for $3,000.[9]
Kruczynski began 2019 back with Springfield,[17] and he was promoted to the Memphis Redbirds in May. He was reassigned back to Springfield in June, and finished the season there. Over 28 games (26 starts) between the two clubs, he pitched to a 4–10 record with a 6.09 ERA, striking out 146 over 147+2⁄3 innings.[18] He did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[19] He returned to Memphis to begin the 2021 season, but pitched only 18+1⁄3 innings due to injury, going 2-0 with a 6.38 ERA and 22 strikeouts.[citation needed] On March 25, 2022, Kruczynski was released by the Cardinals organization.[20]
In 2023, Kruczynski pitched in 3 games for Lake Country, but struggled immensely, allowing 8 runs in 12 hits and 8 walks with 2 strikeouts in 4+1⁄3 innings of work. He was released by the team on May 27, 2023.[22]
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