The Chicago White Sox secured veteran right-handed pitcher Luis Castillo from the Seattle Mariners in a trade that sent right-handed reliever Seranthony Domínguez, outfielder Nolan Jones, and catcher prospect Boston Smith to Seattle. This deal, announced late Saturday, highlights the White Sox's quest to strengthen their rotation as they lead the American League Central.

Luis Castillo, 33, has struggled this season, posting a career-worst FIP of 4.57. However, his overall career stats remain impressive, including a career ERA+ of 115 and three All-Star selections. The White Sox aim to slot him into their rotation behind Davis Martin, Sean Burke, and Erick Fedde.

Trade Grades:

• Chicago White Sox: B
  The White Sox acquire a reliable innings-eater without sacrificing top prospects. Castillo's recent performance shows improvement, allowing two earned runs or fewer in six of his last ten outings. The team absorbed his contract, which helps maintain their farm system's depth.

• Seattle Mariners: A
  The Mariners benefit financially, saving substantial salary while addressing their rotation depth. They traded Castillo, freeing up funds for potential roster improvements. The inclusion of Domínguez strengthens their middle relief, while Smith, hitting .291/.448/.589, is seen as a promising prospect.

This trade reflects both teams’ strategic moves as they navigate their postseason aspirations. The White Sox bolster their rotation, while the Mariners gain financial flexibility, paving the way for future upgrades.