Szapucki was recalled from Triple-A Sacramento on Tuesday.
After recording a 1.08 ERA in Sacramento, Szapucki will make his return to the majors. The 26-year-old lefty has pitched four innings out of the bullpen for the Giants this year, recording a 2.25 ERA and 1.50 WHIP in that time. Fellow releiver Zack Littell was optioned to Triple-A in a corresponding move.