Whisenhunt (1-0) earned the win Wednesday, allowing two runs on six hits and two walks over five innings during a 7-5 win against Atlanta. He struck out two.
Whisenhunt was called up for the start after Tuesday's game got suspended and finished earlier Wednesday, with each club netting an extra roster spot. The lefty, who was making his season debut for the Giants, got through five innings without giving up a run but allowed three straight singles in the sixth and was pulled from the game, with two of those runners coming around to score. The 25-year-old had a 3.65 ERA and 1.33 WHIP in 13 starts and one relief appearance in Triple-A Sacramento, where he'll likely return following the spot start.