Gareth Maybin carded five birdies, four bogeys and a double bogey in an erratic final round of one-over-par 72 at the Welsh Open at Celtic Manor.
The Ballyclare golfer had posted earlier rounds of 71,75 and 73 as he ended in a tie for 52nd on seven over.
Maybin had bogeys at the first, second, third and 13th holes, plus a double bogey six at the fourth.
He had birdies at the 10th, 11th, 14th, 17th and 18th holes and ended up 15 shots behind winner Gregory Bourdy.
Frenchman Bourdy finished eight under, with American Peter Uhlein two shots adrift in second and Dane Soren Kjeldsen third on five under.
Ireland's Damien McGrane tied for sixth on two under after a 71 while European Ryder Cup captain Paul McGinley ended in a share of eighth on one under thanks to a closing 72.
David Higgins took joint 26th position on two over following a 72.