Darren Clarke posted a closing round of one-over-par 72 to finish on seven over, 10 shots behind winner Phil Mickelson at the Open at Muirfield.
Clarke, the 2011 champion, carded four birdies and five bogeys in his round to end in a tie for 21st place.
Graeme McDowell fired a disappointing 77 to lie in equal 58th position on 12 over after a round which included a double bogey and four bogeys.
Mickelson shot a 66 to win by three shots from Swede Henrik Stenson.
Ian Poulter, Adam Scott and Lee Westwood were a further shot behind in third on level par.
Clarke recorded an early bogey at the fifth but recovered to post three consecutive birdies at the seventh, eighth and ninth holes.
Bogeys followed at the 10th, 14th, 17th and 18th holes on his inward nine, along with a solitary birdie at the 12th.
McDowell began his final round in disastrous fashion with a bogey at the first being quickly followed by a double-bogey six at the second and a bogey at the fourth.
A further blemish at the eighth saw McDowell shoot 41 for his outward nine, but the former US Open champion steadied the ship with six successive pars, before registering another bogey at the 16th.
"I made a very slow start and was chasing it a bit after that - I became a little impatient," admitted the Portrush man.
"I wasn't hitting it great and I wasn't putting great, and on a course like this you have to be on your game.
"Each day could have been a bit better for me and this place slowly grinds you down," added McDowell.
Shane Lowry and Padraig Harrington both shot rounds of 70, their best of the week, to end the tournament on nine over and 11 over respectively.