The Red Sox also assigned catcher Ronaldo Hernández, who they signed to a minor league deal July 17, to Double-A Portland to make room for Tromp. He appeared in four games for Worcester.

Star? Boston needs a true No. 2 and Pittsburgh's Mitch Keller could be the perfect target at the trade deadline.

The Boston Red Sox of late have flipped their script. After dealing away their best hitter, Rafael Devers, in a puzzling June blockbuster, the Sox bumbled to a 3-7 mark in the days immediately following the trade.