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PHOTO: Sean Desmond - by Golffile.
The win propels him up the Bridgestone Order of Merit while Egan's runner-up finish sees him jump into third and he occupies one of the automatic spots for the Home Internationals back here at Lahinch in September.
Getting off to a strong start, Egan had taken the early lead, 2up through three holes with par at the opening hole and a concession on the third.
A two-putt par for Desmond on the 6th was enough to halve the deficit before the match was back to all square on the 7th after Egan found trouble more than once down the left side of the hole.
Egan's lead was restored with a two putt par on the 8th and the Kildare man was ahead at the turn.
On the 10th Egan missed the fairway left and after hacking up short left, he missed a 15ft putt for a half in par. Desmond would edge ahead on the 13th. A 12ft putt downhill finds the bottom of the cup and Egan missed from 6ft.
On the par three 16th, and with nerves showing, Desmond had an 18 inch putt for a half. When he failed to hole, the match was back to all square.
The Corkman holed a 9ft putt on the penultimate green for par and when Egan missed from a similar distance, Desmond was ahead once more.
Both players were past the pin in regulation on the final hole. Egan gave his birdie putt every chance, just missing, which allowed Desmond step up to roll his birdie putt close and the 21 year old from Monkstown was the South of Ireland champion.
It's his first championship victory and he moves to 13th in the Bridgestone Order of Merit with two events remaining.
Desmond had demonstrated his pedigree earlier in the championship, beating two current Ireland internationals on his way to victory, Conor Purcell in round two and Tiarnán McLarnon in the quarter-finals. Sean Flanagan, former North of Ireland champion, fell to the champion in the semi-final by a single hole margin.