By Tony Jimenez

ASH (Reuters) - Britain's Ross Fisher, who contemplated pulling out of the European Open at the start of the week, banished any thoughts of fatigue to gallop to a seven-shot victory in Sunday's final round.

The 27-year-old clinched his second tour win with a 68 for a 20-under-par total of 268 on a wet and windy day at the London Club, seven clear of world number eight Sergio Garcia who defied the elements with a sparkling, best-of-the-day 66.

Fisher, who led from start to finish after firing a course record 63 in the opening round, began the day three clear of Graeme McDowell.

But there was little doubt about who would pick up the first prize of 400,000 pounds after McDowell double-bogeyed the par-three third, his wayward tee shot finding the water.

The big-hitting Fisher effectively drove the last nail in his playing partner's coffin two holes later by ramming in a 60-foot putt for an eagle three.

On Thursday, the fast-improving Fisher said recent golfing exertions had left him drained and he entertained thoughts of withdrawing. "But how do you pull out of an event when you only live 40 minutes away?," he added.

McDowell (73) finished third on 276.

(Editing by Trevor Huggins)