Before throwing a single pitch in the regular season, San Francisco's Matt Cain wound up on the disabled list. The Giants said Tuesday that Cain has a flexor tendon strain in his right forearm, and put the 30-year-old right-hander on the DL retroactive to April 4. Cain will return to San Francisco for further evaluation. He could miss a few weeks, manager Bruce Bochy said before Tuesday's game against the Arizona Diamondbacks.