The Yankees' decision to replace Hamilton underscores the challenges teams face in managing player health during the intense postseason.

Before Game 4 of the American League Championship Series, the New York Yankees made a significant roster change, replacing injured reliever Ian Hamilton with Mark Leiter Jr.

Hamilton's season came to an abrupt end after an MRI revealed a significant left calf injury he sustained while covering first base during Game 3 against the Cleveland Guardians.

The 29-year-old Hamilton had previously missed over two months of the regular season due to a lat strain, finishing with a 3.82 ERA and 41 strikeouts over 37 2/3 innings.

In Game 3, the Yankees suffered a setback when closer Luke Weaver allowed a game-tying homer to Jhonkensy Noel in the ninth inning, contributing to their loss.

Despite the loss, the Yankees currently lead the best-of-seven ALCS 2-1, with Game 4 set for Friday night.

Mark Leiter Jr., who was acquired from the Chicago Cubs at the trade deadline, will now take Hamilton's place on the postseason roster.

Since joining the Yankees, Leiter has posted a 4.98 ERA with 33 strikeouts in 21 2/3 innings, although he struggled in the final months of the regular season.

Leiter's inconsistent performance contributed to the Yankees' decision to make this roster change ahead of a crucial playoff game.

MLB's medical director, Dr. Gary Green, reviewed Hamilton's medical information before the Yankees finalized the roster change.

Both Weaver and setup man Clay Holmes have pitched in every postseason game, raising concerns about their workload and potential impact on performance.

Prior to his injury, Hamilton had pitched only 1 2/3 innings in the postseason, limiting his contributions during this critical time.