At Thomaston, Josh Oulette tossed a complete-game three-hitter to lead the Tigers to the road win.
Ouelette struck out seven, walked four and hit a batter in helping Gardiner earn its seventh win.
Brandon Chaput had three singles and scored three runs for Gardiner, which snapped a 1-1 tie with three runs in the fifth inning as Jake Palmer, Chaput and Josh Mashke all singled and came around to score on two Oceanside throwing errors.
Dylan Maloney (2-1) fired a complete-game six-hitter for Oceanside, striking out six batters and walking two. Anthony Campagnoli drove in the Mariners’ lonerun with a sacrifice fly.
Gardiner (7-2) 001-030-2 — 6-6-0
Oceanside (3-4) 001-000-0 — 1-3-5
Maloney and Tobin, Oulette and Orewiler