Rockies pitcher Manny Corpas may need to undergo Tommy John surgery on his throwing elbow. "My ligament is no good," he said. "I think it's old." Corpas was placed on the 15-day disabled list with a sprained ulnar collateral ligament after coming off the mound in pain on Wednesday. "My arm was a little bit sore, but I'm trying to help," Corpas said. "I knew my arm was no good in the first inning. When the trainer (Keith Dugger) asked me, 'Are you OK?' I said 'I'm OK' because I'm trying to help. Maybe that's my fault that I kept throwing, but I did it for the team." Corpas will get a second opinion on the elbow next week.