The Giants optioned Black to Triple-A Sacramento on Friday, Maria I. Guardado of MLB.com reports.
Black (1-5) took the loss against the Diamondbacks on Wednesday, allowing four runs on five hits and five walks over 2.2 innings while striking out three.
Black (0-4) took the loss against the Padres on Saturday, allowing two runs (one earned) on six hits and one walk over four innings while striking out two.
Black is scheduled to start Friday's game against the Padres in San Diego.
Black (0-2) took the loss against the Marlins on Saturday, allowing two runs on four hits over five innings while striking out six.
The Giants recalled Black from Triple-A Sacramento ahead of his start Saturday versus the Marlins.
The Giants optioned Black to Triple-A Sacramento on Wednesday, Andrew Baggarly of The Athletic reports.
The Giants recalled Black from Triple-A Sacramento on Tuesday, Shayna Rubin of the San Francisco Chronicle reports.
Black was optioned to Triple-A Sacramento on Friday.
Black will not start Thursday's contest against the Pirates.