White Sox P Jake Peavy is diagnosed with rotator cuff tendinitis and his return to action is uncertain. Peavy has been very effective when he has been able to pitch since the Sox acquired him in a trade with the Padres in 2009, but he has spent most of his time in Chicago on the disabled list.

The Padres claim sidearming reliever Pat Neshek on waivers from the Twins. It’s a bit of a gamble as Neshek’s last effective season was in 2007; he has since been slowed down by a string of injuries.