Valimaki and Stone finished level on 13-under par at Al Mouj Golf after both shot two-under-par 70s in the final round in difficult, breezy conditions by the coast.

The duo halved the first two playoff holes on the par-4 18th but when South African Stone faltered with a bogey on their third time around, par was enough for Valimaki to seal victory.

The 21-year-old, who secured his European Tour card at the Qualifying School, recorded his first top-10 finish at the Vic Open last month and is now a winner in only his sixth Tour appearance.

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Valimaki took the lead in the final round with back-to-back birdies from the 7th hole but then found a bunker on the 9th on his way to a double bogey.

“It's awesome. There are not many words to say. It's unbelievable.” – Sami Valimaki

He roared back with four birdies on the back nine, including a clutch putt from 20 feet to force the extra holes with Stone.

"It's awesome," he said. "There are not many words to say. It's unbelievable.

"After the 9th hole, when I made a double, I knew that the 10th hole is good and I had to make birdie on that.

"I didn't make a really good par on 11 and after that bogey I felt like, 'okay this is gone'. But then I just grinded, made three birdies and on the last, an awesome birdie."

France's Adrien Saddier took third after carding a 69 to finish on 12-under while Italian Guido Migliozzi and Finn Mikko Korhonen were a shot back to share fourth place.

Australian Maverick Antcliff carded 70 in the final round to finish 10 shots off Valimaki while compatriot Scott Hend shot seven bogies to end another six shots back.

- Hardik Vyas, Reuters