Newcastle have rediscovered their attacking flair for the A-League finals, while consigning Central Coast to the wooden spoon with an 8-2 flogging.
Riley McGree scored a hat-trick on Saturday night at Central Coast Stadium and Roy O'Donovan netted a double. The second-placed Jets dominated, coming into the final-round match off three-consecutive losses and two goalless efforts.
Newcastle led 3-0 inside 24 minutes through goals to Joey Champness (10th minute), O'Donovan (20th) and McGree (24th).
Champness finished from a McGree ball, Steve Ugarkovic put O'Donovan away on goal and McGree did it all himself with a strike from the edge of the box.
The Jets were in control until Andrew Hoole's deflected cutback fell to Connor Pain, who scored in the 39th minute for the hosts.
The Mariners, in last place after Wellington upset Melbourne City 2-1 earlier on Saturday, peppered the Jets' goal late in the half without success.
Newcastle, who will host a grand-final qualifier on April 27, lost centre-back Ben Kantarovski to a hamstring injury just before halftime.
The Jets quickly snuffed out any hope of a Mariners comeback when McGree scored with another left-foot strike in the 53rd minute. Lachlan Jackson, who came on for Kantarovski, made it 5-1 with a free header off a Dimi Petratos corner in the 61st minute.
Champness was fouled by Jake McGing and O'Donovan converted from the spot in the 67th minute and McGree struck again eight minutes later. Trent Buhagiar pulled one back for Central Coast in the 80th but Petratos made it 8-2 a minute later.
It is just the second time a side have scored eight goals in an A-League match.
The thrashing marred the farewell of retiring Mariners stalwart Josh Rose, who was substituted in the 72nd minute to a standing ovation.