MLB Trade Deadline 2025: Instant Takeaways to Padres Landing Mason Miller originally appeared on Athlon Sports. The surging San Diego Padres entered the 2025 MLB trade deadline with three All-Star relievers already in their bullpen. They now have a fourth.

Preller brought flame-throwing closer Mason Miller along with starter J.P. Sears to San Diego in a deal with the A’s, trading away No. 3 overall prospect Leo De Vries and three other top-20 prospects in the Padres’ system.

Here are five winners and three losers from the MLB trade deadline. Nobody worked like San Diego on Thursday. The Padres headlined the day with Mason Miller coming over from the Athletics. The team also added to the lineup with Ramon Laureano and Ryan O'Hearn from the Baltimore Orioles.