[1] Blalock made his professional debut with the rookie–level Gulf Coast League Red Sox, logging a 6.75 ERA in 4 games (3 starts).
[2] Blalock spent the 2021 campaign with the Single–A Salem Red Sox, making 23 starts and compiling a 3–6 record and 4.27 ERA with 85 strikeouts over 86+1⁄3 innings pitched.
[11] On June 19, Blalock was promoted to the major leagues for the second time,[12] and he made his MLB debut the following day.
On July 27, 2024, Blalock and Yujanyer Herrera were traded to the Colorado Rockies in exchange for Nick Mears.
On August 24th, Blalock earned his first career win against the eventual 2024American League champion New York Yankees.