Nicholas Austin Mikolajchak (; Major League Baseball 2021 Player Name Presentation Preferences and Pronunciations. Retrieved April 27, 2021 born November 21, 1997) is an American professional baseball pitcher for the York Revolution of the Atlantic League of Professional Baseball.
In 2016 as a freshman, Mikolajchak worked exclusively as a reliever and a closer for the team, posting a 3.38 ERA and an 0–4 record in 32 games. As a sophomore in 2017 for Sam Houston State, he played in 22 games, starting nine and closing two of them. He went 5–4 with an earned run average of 4.19 in 73 innings. Mikolajchak played collegiate summer baseball for the Falmouth Commodores of the Cape Cod Baseball League in 2018, pitching in 8 games and scoring an earned run average of 1.84. For Mikolajchak's junior season in 2019, he pitched in 23 games, starting and closing 7 games each. He pitched innings and compiled a 5–4 record with 74 , improving from 32 in his freshman year.
Mikolajchak elected to forgo his senior season at Sam Houston State and signed with the Indians on June 14, 2019. In his first professional season with the Indians, Mikolajchak played for two of the Indians' minor league affiliates, combining for a 1–1 record with an 0.36 earned run average and 36 strikeouts across 17 games. He did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.
Mikolajchak made the Indians' alternate site roster for the beginning of the 2021 season. He spent the year with the Double-A Akron RubberDucks, recording a 2–5 record and 3.18 ERA with 57 strikeouts and 8 saves in innings of work. Mikolajchak played the 2022 season with the Triple-A Columbus Clippers, working to a 5–2 record and 3.04 ERA with 50 strikeouts and 6 saves in innings pitched across 47 appearances.
In spring training the following year, Mikolajchak seemed poised for a spot in the Guardians’ bullpen after pitching to a 1.93 ERA over seven appearances. However, he left an appearance against the Arizona Diamondbacks on March 18, 2023, and was later diagnosed with a sprained right ulnar collateral ligament. He returned to action in 2024 with Columbus, where he posted a 3-1 record and 3.50 ERA with 26 strikeouts over 36 innings of work.
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