SEATTLE, WASHINGTON - OCTOBER 05: Luis Castillo #58 of the Seattle Mariners celebrates with teammates after being pulled from the game against the Detroit Tigers during the fifth inning in game two of the Division Series at T-Mobile Park on October 05, 2025 in Seattle, Washington. (Photo by Steph Chambers/Getty Images) GettyWWith less than 48 hours remaining until Mondays MLB trade deadline at 6 p.m. ET, deals are starting to fly in.The latest came Saturday night when the Chicago White Sox and Seattle Mariners agreed to a blockbuster trade.White Sox Acquire 3-Time All-StarChicago desperately needed starting pitching, and the front office addressed that need by acquiring three-time All-Star Luis Castillo from the Mariners.The White Sox paid a steep price, sending reliever Seranthony Dominguez, outfielder Nolan Jones, and catching prospect Boston Smith to Seattle.Breaking: The Chicago White Sox are acquiring right-hander Luis Castillo in a trade with the Seattle Mariners for reliever Seranthony Dominguez, outfielder Nolan Jones and catching prospect Boston Smith, sources tell @JeffPassan.Get breaking news alerts from Jeff Passan through pic.twitter.com/l4Au4PTHfC ESPN (@espn) August 2, 2026The White Sox will also assume the remainder of Castillos contract, paying him $22.75 million this season and another $22.75 million in 2027.Castillos 2026 SeasonCastillo hasnt looked like himself in 2026, but a change of scenery could help him rediscover his previous form.He joins Chicago with a 3-9 record and a 5.06 ERA across 17 starts and 20 appearances this season.Now in his 10th MLB season, Castillo may be showing signs of regression, though this could simply be an outlier year. He posted a 3.54 ERA last season, and over the course of his career, he has finished with an ERA above 4.00 only once.White Sox Right NowThe White Sox have been one of baseballs biggest surprises this season and, entering Saturday night, sit firmly in the American League playoff race.Chicago is 58-52 and holds a 2.5-game lead over the Cleveland Guardians and a 3.0-game lead over the Minnesota Twins in the AL Central.Castillo may not solve every problem, but he gives the White Sox another proven arm as they try to make a serious postseason push in an American League that appears wide open.Like HEAVY's content?Be sure to follow us.This article was originally published on HEAVYThe post Chicago White Sox Acquire 3-Time All-Star in Blockbuster Trade With Mariners appeared first on HEAVY.