Boston Red Sox pulled off the upset to defeat Seattle Mariners. Boston Red Sox entered the game as the underdog, with a 43% chance to win before the game started.
From the outset, Boston Red Sox refused to go away, chipping away at Seattle Mariners's lead until Boston Red Sox took their first lead toward the end of the game. Seattle Mariners never recovered after losing the lead, and by the time the game ended, Boston Red Sox had earned the upset.