Warman had five birdies in his first seven holes at San Clemente Municipal Golf Course. He had started the final round trailing Sullivan by three shots after Sullivan opened with 8-under 64 and Warman had 67. Sullivan, however, was 1 over after those same holes on Sunday.
Warman is a former San Diego State player and a San Clemente native who won this event in 2016. Sullivan won the event in 2014.
Taylor Casper was third at 8 under after rounds of 66-70. Quentin Hill was fourth at 6 under after going 70-68.
