On August 24, 2013 — After the teams combine for 137 at-bats, 35 hits, 32 strikeouts, and 28 walks, the Diamondbacks beat the Phillies at Citizens Bank Park, 12-7. The 18-inning contest takes seven hours and six minutes to complete, making it the longest game in history, in terms of time, for both franchises.
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Sources:
Baseball Reference August 24
National Pastime August 24
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game