The Pirates’ Ed Ott hits a grand slam off Phillie reliever Tug McGraw in the 8th inning as the Bucs win, 14 – 11. It is the 4th grand slam that McGraw has yielded this year‚ setting a new National League mark and tying him for this questionable honor with Detroit’s Ray Narleski (1959).

On August 11, 1979 — The Pirates’ Ed Ott hits a grand slam off Phillie reliever Tug McGraw in the 8th inning as the Bucs win, 14 – 11. It is the 4th grand slam that McGraw has yielded this year‚ setting a new National League mark and tying him for this questionable honor with Detroit’s Ray Narleski (1959).

Source:
Baseball Reference August 11
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game