The Giants recalled Whisenhunt from Triple-A Sacramento ahead of his scheduled start Sunday versus the Angels in San Francisco.
Whisenhunt will be entering the rotation in place of Trevor McDonald (elbow), who could be facing a long-term absence after he was diagnosed Friday with a UCL sprain. The Giants previously called Whisenhunt up for spot starts June 17 and July 9, but the southpaw has otherwise spent the entire season in the Triple-A rotation. Over 82.1 innings in the hitter-friendly Pacific Coast League, Whisenhunt has submitted a 4.15 ERA, 1.43 WHIP and 90:38 K:BB across 82.1 innings.