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 Mariners will need to trade some prospects in order to become World Series contenders, and here are two that should be on the move.

Per MLB.com's Daniel Kramer, the Mariners and LSU star pitcher Kade Anderson agreed on a signing bonus worth around $8.8 million. That signing bonus is $700,000 lower than the slot value for the No. 3 pick, Kramer noted, so Seattle will get some flexibility with the leftover money.

Seattle Mariners infielder Cole Young officially graduated off the MLB Top 100 prospects list on Tuesday night, meaning the Mariners are down to eight Top-100 p

Jorge Polanco and Cole Young hit back-to-back solo home runs in a four-run ninth inning and the Seattle Mariners beat the Detroit Tigers 8-4 to complete a three-game sweep.

Fujinami has signed a deal with the Yokohama DeNA BayStars of NPB, that team announced. Seattle released Fujinami from the minors last week, presumably to pursue such a new contract. The 6-foot-6 righty throws hard and joined the A's in 2023. He had an 8.57 ERA with Oakland, though.

The Seattle Mariners and Arizona Diamondbacks could be the dream trade partners ahead of the deadline this season.

Cal Raleigh is set to play in his first All-Star Game this week, and the Seattle Mariners star announced Monday that he plans on participating in another iconic baseball event next year.