Walker earned a save in Saturday's 3-1 win over the Tigers, allowing one hit and one walk with two strikeouts in a scoreless ninth inning.
Walker was named the Giants' closer Friday night and immediately found himself in his new role. He put two runners on with one out but responded with two strikeouts to register his first save of the year. The 28-year-old owns an impressive 2.20 ERA, 0.90 WHIP and 73:14 K:BB across 61.1 innings this season and should be rostered in nearly all fantasy formats now that he has the potential for saves.