Mets starting pitcher Johan Santana is set to throw off a mound to test his left elbow. Santana, who will throw on Tuesday, had surgery on his throwing elbow late last season. "I'm feeling good. Time will tell, but I am feeling good," Santana said Monday. "We did a pretty good job with the offseason, working out and doing all the rehab, and I'm feeling good. Everything is on schedule." Santana went 13-9 with a 3.13 ERA in 25 starts in 2009.