The Houston Astros have bolstered their bullpen by acquiring left-handed reliever John Rooney from the Miami Marlins for cash considerations. Rooney, who is yet to make his major league debut, has impressed at the Triple-A level with a 2.45 ERA across 38 appearances this season. He brings significant strikeout ability, boasting a 32.4% strikeout rate, although his walk rate at 16.5% raises concerns. His addition provides the Astros with five left-handed options in the bullpen, augmenting their depth as they prepare for a critical series against the Red Sox.