Host Salt Lake took the lead in the 21st minute when Matias Mantilla, with a diving header, relayed a Williams corner kick to Beckerman, who tapped the ball home. Beckerman extended the lead with a 28-yard rocket.
Soon after, Movsisyan added a third after taking a pass from Matias Cordoba and splitting keeper
Preston Burpo and defender James Riley.
Williams, assisted by Tino Nunez, scored his goal in the 90th minute.