One team with an abundance of left-handed relievers and another possibly in the market for one go head-to-head Wednesday afternoon when the visiting Colorado Rockies take on the San Francisco Giants in the finale of a pitching-dominated, three-game series. Right-handers German Marquez (7-3, 4.32 ERA) of the Rockies and Jeff Samardzija (4-6, 4.23) of the Giants hope they can duplicate efforts they produced the last time they faced Wednesday's opponent. Rockies right-hander Jon Gray and righty relievers Jairo Diaz, Scott Oberg and Wade Davis combined on a six-hitter in the series opener Monday, delivering Colorado a 2-0 win.