The Giants optioned Beck to Triple-A Sacramento on Sunday, Alex Pavlovic of NBC Sports Bay Area reports.
The right-hander was called up from Sacramento on Tuesday and pitched in Saturday's 9-2 win over the Angels, giving up a run over two innings of relief. Beck has a 6.39 ERA, 1.34 WHIP and 5:3 K:BB across 12.2 frames in the majors this season.