New Delhi, Aug. 2 -- CHICAGO - For eight seasons, Luis Castillo was the pitcher other teams built their rotations around. His durability was singular. No right-hander in the American League had started more games since 2018, and Seattle's managers planned each spring around his ability to absorb innings the way other arms could not. On the last night of July, the Mariners moved on.

Seattle traded Castillo, 33, to the Chicago White Sox on August 1, sending a three-time All-Star to a team that leads the AL Central by 2.5 games and needs its rotation to hold through October. In return, the Mariners received right-handed reliever Seranthony Dominguez, outfielder Nolan Jones, catching prospect Boston Smith, and cash considerations, NBC Sports...