Amaya Rivera went 3-for-4 with three runs scored to lead top-seeded Perth Amboy to an 11-1 victory over eighth-seeded South Amboy in the quarterfinal round of the Greater Middlesex Conference Invitational in Perth Amboy.Perth Amboy (8-12) broke open a close game with a seven-run third inning and added two more runs in the fourth to secure the mercy-rule victory in five innings.