The Astros are selecting reliever Alimber Santa onto the MLB roster, reports Héctor Gómez. Houston opened a spot on the 40-man roster by designating righty Cody Bolton for assignment on Monday. They’ll only need to create an active roster spot by optioning a pitcher before Friday’s series opener at Wrigley Field.

It’s the first MLB call for the 23-year-old Santa. The 5’10” righty signed with Houston for $75K as an amateur out of the Dominican Republic in 2020. He struggled early in his minor league career but earned a nomination to last year’s Futures Game with an impressive season. Santa turned in a 2.31 earned run average while striking out 28% of opponents across 70 innings between the top two minor league levels.

Baseball America ranked Santa the #28 prospect in the Houston system over the winter. Their offseason scouting report credited him with a five-pitch arsenal, but this season’s Triple-A pitch tracking data indicates he has only used a mid-80s slider and a 94-95 mph four-seam fastball. Santa’s slider has been his best pitch throughout his time in the minors. He’s using it almost two-thirds of the time with strong results.

This year, Santa has fanned 32% of opponents while allowing only five runs (three earned) over 19 Triple-A innings. His 9.2% walk rate is close to league average, an improvement after he walked 13% of batters faced a year ago. He has plunked three batters and has a career 14.3% walk percentage over six minor league seasons.

Santa will come to town hoping to boost a bullpen that has been one of the worst in the Majors. They carried an MLB-high 5.78 ERA into play Wednesday, though that’ll drop slightly after AJ Blubaugh and Nate Pearson combined for two scoreless innings today. Houston relievers have allowed the most home runs (35) while ranking in the bottom third of the league in strikeout rate.