Bielak will join the Astros for big-league camp this spring, Chandler Rome of the Houston Chronicle reports.
Bielak isn't far from the majors, though he may need a bit more time before he's in serious consideration for a big-league roster spot. In 14 starts and one relief appearance for Triple-A Round Rock last season, he recorded a 4.41 ERA, striking out 24.4 percent of opposing batters while walking 10.2 percent.
Bielak was promoted to Triple-A Round Rock on Friday, Chandler Rome of the Houston Chronicle reports.
The 23-year-old recorded a 3.75 ERA in 36 innings for Double-A Corpus Christi to start the season after posting a 2.35 ERA in 61.1 frames at the same level last season. Bielak profiles as a future backend starter with an average fastball, above-average command and two quality breaking balls (a slider and a curve).