Sophomore forward Dan Sargent scored the only goal of the game for No. 11 seed Westmont, which has won seven games in a row.
The home of Warrior coach Dave Wolf was burned to the ground. One Westmont soccer player lost the home he was renting, another had his dorm room consumed by fire and a third player's dorm room suffered extensive water damage.
The win over Baker moves the Warriors into Wednesday's quarterfinals against first-time participant Mount Vernon Nazarene, which upset Lindsey Wilson, 1-0.