Philadelphia Phillies pitcher Schoolboy Rowe pinch hits with the bases loaded in the 6th inning and cracks a grand slam off the Boston Braves’ Al Javery to break a tie. The Phillies win, 6 – 5, but it takes them 12 innings. For Rowe, it is his second career grand slam. He hit one in 1939 while with Detroit, as he is the only pitcher in major league history to hit a grand slam in each league. Rowe will finish the season with a .306 batting average as a pinch hitter.

On May 2, 1943 — Philadelphia Phillies pitcher Schoolboy Rowe pinch hits with the bases loaded in the 6th inning and cracks a grand slam off the Boston Braves’ Al Javery to break a tie. The Phillies win, 6 – 5, but it takes them 12 innings. For Rowe, it is his second career grand slam. He hit one in 1939 while with Detroit, as he is the only pitcher in major league history to hit a grand slam in each league. Rowe will finish the season with a .306 batting average as a pinch hitter.

Source:
Baseball Reference May 2