Steven Hajjar, 21, ranks 18th. He was a second-round pick in 2021 out of the University of Michigan. In 12 starts in the Single-A Florida State League this season, he was 2-2 with 2.89 ERA.
Mahle joins fellow starting pitcher Luis Castillo, pitcher Phillip Diehl and outfielders Tommy Pham and Tyler Naquin on the list of players traded since Thursday.
The Twins lead the American League Central Division by one game with a 54-48 mark. The Reds (41-61) are 16 games back in the National League Central Division and 14 games back in the wild-card race.