In the 8th inning of a 5 – 5 game at Wrigley Field, Cubs 3B Norm McMillan hits a line drive down the LF line with the bases loaded. Reds LF Evar Swanson, shaded toward center, can’t find the ball, which he sees bounce off a gutter in foul territory. McMillan circles the bases and four runs score. Later, Cubs relief P Ken Penner picks up his jacket in the bullpen and discovers the ball in his right sleeve. It is Chicago’s 8th grand slam of the year.

On August 26, 1929 — In the 8th inning of a 5 – 5 game at Wrigley Field, Cubs 3B Norm McMillan hits a line drive down the LF line with the bases loaded. Reds LF Evar Swanson, shaded toward center, can’t find the ball, which he sees bounce off a gutter in foul territory. McMillan circles the bases and four runs score. Later, Cubs relief P Ken Penner picks up his jacket in the bullpen and discovers the ball in his right sleeve. It is Chicago’s 8th grand slam of the year.


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Sources:
Baseball Reference August 26
National Pastime August 26
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game