The Montreal Expos faced off against the Chicago Cubs on September 15, 1977, at Stade Olympique. The Cubs sent Bill Bonham to the mound, while the Expos countered with Wayne Twitchell. At this point in the season, the Cubs were trying to keep pace in the National League East, while the Expos were looking to play spoiler. The 1977 season was marked by the New York Yankees and Los Angeles Dodgers' dominance in their respective leagues, setting up an exciting potential World Series matchup.

The game started off with an unearned run by the Cubs in the first inning due to an error by the Expos' third baseman Papi. The Expos quickly responded with two runs in the bottom of the first, with Cash and Papi scoring on a double by Valentine. The Cubs managed to tie the game in the fourth inning, but the Expos reclaimed the lead in the bottom half of the same inning with a home run from Carter. Despite a solo home run from Morales in the sixth inning, the Cubs couldn't maintain a lead, with the Expos tying the game in the eighth inning.

The ninth inning saw the Expos pull off a come-from-behind victory with a run in the bottom of the ninth, leading to a 5-4 win over the Cubs. This game was a microcosm of the Cubs' season, as they struggled to maintain leads and finished the season in fourth place in the National League East. The Expos, on the other hand, finished the season in last place, but showed promise for the future with young talent like Gary Carter and Andre Dawson. The 1977 season eventually culminated in a World Series victory for the New York Yankees over the Los Angeles Dodgers.

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