Walker didn't factor into the decision Tuesday against the Rockies after allowing two runs on four hits with five walks and six strikeouts over six innings.
Despite tying his season high in walks, Walker was able to keep Colorado off the board except for a Carlos Gonzalez two-run homer in the third inning. Walker exited after six frames with the game tied 2-2, but Gonzalez was able to break that tie with another long ball in the seventh to give the visitors a 4-2 victory. The 25-year-old righty has a sparkling 1.26 ERA over his past five starts and should maintain that dominant form Sunday in San Francisco.