We have an interesting battle here between two similar starting pitchers in terms of raw stats, but I'll take the veteran at home over the youngster on the road on just 4 days rest. Walker has a 8.27 ERA and a 2.11 WHIP on the road this year and in 3 road starts on 4 days rest he's allowed 16 ER in 12.2 innings pitched. The Giants are a very good offense ranking 6th in OPS vs. RHP and I see Walker getting bounced out of this game early. Hudson meanwhile can get by with his experience and it should help that the Mariners batters only have a 74 AB against him for a .520 OPS. Hudson has a 1.17 WHIP at home and his bullpen is also better. He also gets to go against the Mariners offense which is 28th in OPS vs. RHP.