The 33-year-old Polish LIV Golf player closed with a four-under 68 to finish on 20-under par, ending a 1,078-day wait for his first victory since the 2023 Estrella Damm N.A. Andalucia Masters.
More importantly, the result secures Meronk full DP World Tour membership for 2027 after he had been chasing enough points to retain his playing status.
Meronk began the final round two shots behind Jarvis but quickly erased the deficit, making birdies at the first two holes before moving alongside the South African.
Jarvis briefly restored his advantage with a birdie at the fourth, with both players also making birdies at the fifth, but the momentum began to shift decisively on the back nine.
A three-putt bogey at the ninth left Jarvis level with Meronk, who then took control with a birdie at the 12th after Jarvis had dropped another shot at the par-three 11th.
Meronk extended the advantage to three with another birdie at the 14th, although Jarvis refused to go away after making a remarkable 30-foot putt from short of the 15th green.
The decisive moments came at the Road Hole, where both players made bogey at the 17th. Jarvis missed his par putt from six feet, meaning Meronk still held a two-shot advantage heading to the last.
Jarvis needed an eagle at the 18th to force a playoff, but after reaching the fringes with his drive, he could not convert the lengthy putt. His closing 72 left him tied for second on 18-under with Niklas Norgaard, who carded a 68.