McGlinchey scored from a header, after Jeremy Brockies' missed penalty rifled off the bar, and the pair had a hand in the winning goal too, scored by Nathan Burns. Merrick picked out the attacking trio as his best performers, and made special mention of Glen Moss' late save that earned them the three points.
"We were pretty dominant in midfield. Forward passing was good, can get better though. The new signings seem to be doing a good job of fitting in well."
Dutch midfielder Roly Bonavacia put in an energetic shift with a number of nice touches and looks to be developing a better understanding with Albert Riera and Alex Rodriguez.
Fullback Tom Doyle recovered from scoring a freak own-goal to deliver an inch-perfect cross which lead to the Phoenix's winner and grew in confidence as the match went on.
The Phoenix back four made a shaky start, but after going 2-1 up did a good job of making the field compact and preventing the Mariners' attackers from having any space or time on the ball.
The Phoenix host the Newcastle Jets on Sunday at 5pm.