Brandon Michael Bielak (born April 2, 1996) is an American professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). He is 6 feet 2 inches tall.
He played college baseball at the University of Notre Dame. He was selected by the Astros in the 11th round of the 2017 MLB draft and made his MLB debut in 2020.
Bielak signed with Houston and made his professional debut with the Gulf Coast League Astros. After two scoreless appearances, he was promoted to the Tri-City ValleyCats where he finished the season with a 1–1 record and a 0.92 ERA in eight games (four starts).
In 2018, Bielak began the season with the Buies Creek Astros and was named a Carolina League All-Star; he was promoted to the Corpus Christi Hooks in June. In 25 games (17 starts) between the two clubs, he went 7–8 with a 2.23 ERA and a 1.15 WHIP.
In 2019, Bielak returned to Corpus Christi to begin the season and was promoted to the Round Rock Express in May. Over 23 games (twenty starts), Bielak went 11–4 with a 4.22 ERA, striking out 119 over 121+2⁄3 innings.
On July 27, 2020, Bielak’s contract was selected to the 40-man roster. He made his MLB debut that day against the Seattle Mariners and was the winning pitcher in an 8–5 contest. Bielak finished the 2020 season with Houston with a 6.75 ERA over 32 innings.
In 2021, Bielak went 3-4 while appearing in 28 games (two starts). He pitched fifty innings and struck out 46 batters while walking 21; he had a WHIP of 1.380 and an ERA of 4.50.