At Turner, Ryan Allender tossed a complete-game seven-hitter and ripped a two-run single in the first inning to propel the Mariners to the road win.
J.T. Tobin and Jordan Carter added RBIs and Drew Townsend collected a pair of hits for 6-4 Oceanside.
Brian Hiscock blasted a pinch-hit home run in the bottom of the seventh for the 4-5 Hornets.
Oceanside 300 001 1 — 5-5-2
Leavitt 000 000 1 — 1-7-3