Second-seeded Corona del Mar High School defeated San Gorgonio Thursday, 18-0, in a first-round Southern Section 4-A tennis match at Corona del Mar. Corona del Mar meets Dana Hills, which defeated Canyon, 16-2, in the second round.
In other first-round 4-A action:
Senior Margo Mullally swept her singles matches to lead Newport Harbor to a 10-7 victory over Capistrano Valley.
Santa Ana tied Rubidoux, 9-9, but advanced on the basis of games won, 76-75. Santa Ana will play third-seeded Edison, which defeated Mission Viejo, 13-5.
Marina only lost one singles match as it defeated Redondo, 13-5. Marina will play Rolling Hills, which beat Estancia, 10-8. El Toro also advanced by beating Riverside Poly, 15-3.
Two other Orange County teams lost in 4-A play. South Torrance beat Foothill, 10-8, and Palos Verdes defeated Fountain Valley, 13-5.