Meronk shot a closing one-under-par 71 on Saturday to get to 17 under and win by two shots from Spanish star Jon Rahm (67) and Colombia's Sebastian Munoz (71).
Australia's Lucas Herbert (70) tied for fourth with South African Dean Burmester (65), three shots behind the winner, with countryman Marc Leishman (68) a further shot back in a tie for sixth with Sergio Garcia (67), Bryson DeChambeau (68), Tyrell Hatton (70) and David Puig (65).
Cameron Smith (70) and Wade Ormsby (69) were next best of the Aussies, tied for 25th at seven under, with Matt Jones (69) tied 33rd.
It was Meronk's first victory of any kind since the Irish Open in 2022 on the DP World Tour.
"With golf, you never know when you get a good form and perform, and that's what happened for me this week, so I'm super happy that it happened in the first tournament," Meronk said.
"I will continue to work on my game, and hopefully I can bring more trophies."
Rahm helped Legion XIII to the team victory at 50 under, 11 shots better than Ripper GC. Hatton, Caleb Surratt (71) and Tom McKibbin (72) of Northern Ireland all contributes to the Legion XIII cause.
Rahm charged into second place with his third consecutive 67 and his Legion XIII won the season-opening event for the second consecutive season.
"Every day I've made, I would say, two big mistakes that I think were avoidable," Rahm said. "... If I could at least clean that up and clean up a couple very, very fixable mistakes, it would have been better."
The field played under the lights for the first time in order to fit the broadcast window for LIV Golf's new US TV partner, Fox Sports.
"I wouldn't say (we are) the night kings," Rahm said of the team success at night. "I think if we come next year and win, then maybe we can start talking about that, but one week doesn't really prove anything."
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