On August 17, 1932 — 1932 – The Cubs and the Braves play 19 innings, the longest game of the season, with Chicago winning 3 – 2. Guy Bush wins in relief. The following day he will again beat the Braves with a brief extra-inning outing.

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Source:
Baseball Reference August 17
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game