SAN FRANCISCO -- Left-hander Eric Surkamp's season officially ended Tuesday when he underwent Tommy John surgery to repair his injured throwing elbow, manager Bruce Bochy said Wednesday. Surkamp entered Spring Training as an outside candidate for the starting rotation and showed promise, posting a 3-1 record with a 4.41 ERA in five Cactus League appearances. He struck out 14 batters and walked five in 16 1/3 innings, representing a considerable improvement over his six-game stint last September with the Giants. Then, he went 2-2 with a 5.74 ERA in six starts with 13 strikeouts and 17 walks in 26 2/3 innings. Surkamp, 25, likely will need a year of physical rehabilitation before he can resume pitching competitively. Famed orthopedist Dr. James Andrews performed the surgery on Surkamp, San Francisco's sixth-round selection in the 2008 First-Year Player Draft.