Roupp is listed as the Giants' probable pitcher for Sunday's matchup against the Padres, Jeff Sanders of The San Diego Union-Tribune reports.
Roupp made his first career start Tuesday and limited the Brewers to two runs across five innings. He'll enter his second turn through the rotation having maintained a 3.44 ERA and 1.31 WHIP with a 36:19 K:BB across 36.2 frames in the majors this season.