The Chicago White Sox have made a significant move by acquiring starting pitcher Luis Castillo from the Seattle Mariners just ahead of the MLB trade deadline.

Context

This trade comes as the White Sox are currently leading the American League Central, a notable turnaround from their previous season's performance.S1S2

Key points

• Luis Castillo is a three-time All-Star pitcher.S2

• The trade was completed two days before the MLB trade deadline.S2

• The White Sox are looking to strengthen their pitching staff with this acquisition.S1

• This trade is considered the biggest of the 2026 MLB season so far.S2

• The White Sox finished the previous season with a 102-loss record.S1

• Castillo's addition is expected to enhance the White Sox's playoff aspirations.S3

• The Mariners are parting ways with a key player as they look to rebuild.S2

• The trade reflects the White Sox's aggressive approach to improve their roster.S1

Why it matters

• Acquiring a player of Castillo's caliber could significantly impact the White Sox's chances in the postseason.S3

• This move signals the White Sox's commitment to competing after a disappointing previous season.S1

• The trade could influence the dynamics of the American League Central race.S2

What to watch

• Monitor how Castillo performs with the White Sox in the upcoming games.S3

• Watch for potential reactions from the Mariners as they adjust to this trade.S2

• Keep an eye on other teams' moves as the trade deadline approaches.S1