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.

The Boston Red Sox get the first chance to reach a long-term extension with star third baseman Alex Bregman, and the organization must lock him down.

The Boston Red Sox signed Alex Bregman to a three-year, $120 million deal last offseason. That deal allows him to opt out after the season, putting pressure on the Red Sox to extend him.