It marked the first grand slam by a Giants pitcher since Shawn Estes did it on May 24, 2000. With his five-RBI night, Bumgarner has driven in more runs than San Francisco regulars Pablo Sandoval (four) and Hunter Pence (three) have all season.
Losing pitcher Jorge De La Rosa (0-2) served up Bumgarner's gopher ball.
Pitching-wise, Bumgarner went six innings, he gave up four earned runs on nine hits with seven strikeouts and two walks.
With the win, the Giants (7-4) remain in a first-place tie with the Los Angeles Dodgers in the National League West.
Photo Courtesy: Madison Bumgarner, PHOTO SUBMITTED