Who's DL are you on now?

San Diego Padres right-hander Mark Prior has had a setback in his rehabilitation, ESPN.com's Buster Olney reports.

In his last rehab outing, he threw 10 or 15 pitches and had a feeling "like a firecracker going off in the back of his shoulder.

Prior signed a $1 million deal with his hometown Padres in December, with the chance to make more in incentives. He started the season on the 60-day disabled list and was expected to be ready to pitch in the big leagues about June 1.

At least he's consistent.