Playing fullback for just the second time since leaving Canterbury in 2021, Watene-Zelezniak scored the match-turning try as the Warriors clinched a 24-20 win at Go Media Stadium in Auckland on Sunday.
The 28-year-old was forced to step into the No.1 jersey when Taine Tuaupiki pulled out of Andrew Webster's side just before kick-off due to the impending birth of his child.
Charnze Nicoll-Klokstad had earlier withdrawn with illness, meaning 10 regular Warriors players were absent for the visit of the Dolphins.
Roger Tuivasa-Sheck, captain Tohu Harris and halfback Shaun Johnson all remain in the club's casualty ward, while Addin Fonua-Blake was forced to sit out the match for disciplinary reasons.
Fonau-Blake left the sheds early and missed his side's victory song following last Sunday's energy-sapping win over premiers Penrith at Magic Round.
There looked to be little chance of a repeat of that song in the opening 20 minutes on Sunday, as the Dolphins took an early lead.
Things got off to the worst possible start for Webster's men when Jamayne Isaako touched down in the corner after just four minutes and Warriors hooker Paul Roache went off with an ankle injury.
Soon after, Herbie Farnworth powered back against the grain, smashing through some paper-thin defence to strengthen the Dolphins' position.
Tries from Chanel Harris-Tavita and Te Maire Martin - either side of a trademark Hamiso Tabuai-Fidow finish - kept the Warriors in the game.
Trailing 16-12 at halftime, the Warriors were made to fight for their win, with much of their hard work coming courtesy of stand-in skipper Mitch Barnett along with Watene-Zelezniak.
The Warriors fullback finished the afternoon with 202 metres from 20 runs and came up with the pivotal try, burrowing over in the 57th minute to give his side the lead.
Marata Niukore crossed to strengthen the Warriors' grip on the game and they were able to survive a nervy finish after a late Isaako try narrowed the scores.
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