Ireland's Shane Lowry withstood howling wind and rain to win his first major at the 148th British Open golf championship by six shots from Tommy Fleetwood on Sunday, describing the achievement as "an out-of-body experience."

In desperately difficult conditions, Lowry's one-over par final round was still more than enough as he finished on 15-under for the tournament to claim the Claret Jug.

"This feels like an out-of-body experience," said the 32-year-old.

"It's just incredible to be sitting here with a trophy in front of me.

"Look at the names on it. I just couldn't believe that it was me. I couldn't believe it was happening."

Fleetwood could not apply enough pressure as Lowry never had less than a three-shot lead throughout his round and a double bogey at the 14th realistically ended the Englishman's challenge as he finished three-over for the day on nine-under.

Roared on by huge crowds despite the inclement weather at Royal Portrush, Lowry had a nervy start as he bogeyed the opening hole.

However, he looked set to romp to victory after making three birdies in four holes between four and seven to move to 18-under.

However, the world number 20 was also struggling and when a six at the par-four 14th for Fleetwood was followed by Lowry's birdie at 15 there was only one winner.

Lowry could even afford the luxury of reveling in a career-defining win as he headed down the 18th to the delight of the home fans in the first Open Championship on Northern Irish soil since 1951.

"I knew I was home and hosed down 18. I let myself enjoy it and it was incredible walking down 18, they were singing and going mad," added Lowry.

"It's funny, I sometimes struggle to play in front of the home crowd and have done in the past, but not over the last few days. I played lovely."