The Boston Red Sox have put themselves in a position to add at the trade deadline. They could target relievers to help bolster their bullpen for an October run.

In this MLB mock trade, the Boston Red Sox send star third baseman Alex Bregman to the Seattle Mariners in exchange for ace Luis Castillo and key offensive depth, shaking up the playoff race before the 2025 trade deadline.

Cam Booser, White Sox: The 33-year-old lefty reliever has a 5.11 ERA, 1.42 WHIP, seven holds, one save, a .223 batting average against, 27 strikeouts and 14 walks in 30 outings (24 ⅔ innings). The White Sox demoted him to Triple-A Charlotte on July 13. Boston traded Booser to Chicago on Dec. 21 for 18-year-old minor leaguer Yhoiker Fajardo.