The Giants re-signed right-handed reliever Tyler Walker to a one-year contract Friday. The Giants first declined their 2008 club option on Walker then brought him back. After returning from reconstructive Tommy John surgery on his throwing elbow and getting called up Aug. 27, Walker went 2-0 with a 1.26 ERA in 15 relief outings for the Giants. He didn't allow a run in 14 of those appearances.