Chicago Cubs pulled off the upset to defeat Arizona Diamondbacks. Chicago Cubs entered the game as the underdog, with a 40% chance to win before the game started.
From the outset, Chicago Cubs refused to go away, chipping away at Arizona Diamondbacks's lead until Chicago Cubs took their first lead toward the end of the game. Arizona Diamondbacks never recovered after losing the lead, and by the time the game ended, Chicago Cubs had earned the upset.