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