Manager Bob Melvin said Friday that Walker will serve as the Giants' closer going forward, Susan Slusser of the San Francisco Chronicle reports.
Walker has been dominant out of the bullpen this season, posting a 2.24 ERA and 0.88 WHIP across 60.1 frames while typically handling the seventh inning for the Giants. With the struggling Camilo Doval now in Triple-A Sacramento, Walker will become San Francisco's go-to reliever in save situations and is worth rostering in all fantasy formats.