The Yankees placed Joba Chamberlain on the disabled list due to an elbow injury:

The Yankees will be without Joba Chamberlain for at least the next three weeks after he was placed on the disabled list with a strained flexor muscle in his right elbow.

Joba was pitching well with 24 K and seven walks in 28 2/3 innings. Those numbers are tough to replace. The Yankees now have their setup man, and the setup man’s setup man on the disabled list.