On the same day they placed right-hander Matt Cain on the disabled list, the San Francisco Giants had a player they hoped would be a key part of the offense go down with an injury. With Brandon Belt unlikely to play, the Giants look to rebound from their first defeat Wednesday night when they try to close out a ninth straight series road win over the Arizona Diamondbacks. After Pablo Sandoval went to Boston and Hunter Pence suffered a broken forearm, San Francisco was counting on Belt to have a bounce-back season after he was limited to 61 games in 2014 due to concussion-related issues. "It's a little frustrating, but I'm pretty optimistic about doing what I have to do to get back out there." The banged-up Giants (1-1) scored enough runs to win the second of this three-game set at Chase Field.