Merewether remains undefeated in Newcastle and Hunter rugby after beating University.
Greens fullback Sam Clifton capped off a scrappy opening 10 when he scored in the corner.
Ryan McCormack kept the Seahorses in the contest with three penalties in the first half.
Merewether was having plenty of trouble at the lineout and Luke Nolan’s frustration earned him a spell in the bin.
The competition leaders finally found some momentum, when Jay Strachan’s run from deep set up Mark Wade, who did the rest.
