After the first play-off hole was halved in scrappy par fives the players returned to the 18th and Casey carved his approach into the crowd and then fluffed his pitch to the green.

Khan, who had missed from six feet on the 72nd hole to claim victory, then two-putted for birdie from the front edge of the green to claim his first European Tour title.

The 31-year-old from Essex equalled the tour record with a front nine of 27 in his course record 61 on Friday when he threatened to shoot the first round of 59 in Europe.

He had never finished higher than fourth before on tour and looked destined to miss out on victory when Casey was four ahead with seven holes to play.

But the Ryder Cup hopeful, who would have virtually sealed his place in the European side with victory, ran up a double-bogey six on the 15th while Khan had three birdies in four holes to edge ahead for the first time on the 16th.

Both players then found the same greenside bunker on the 72nd hole but Casey bravely holed from 10ft for birdie and Khan missed from six feet to take the tournament into extra holes.

Khan’s win came just seven days after Scott Drummond’s even more surprising victory in the PGA Championship, and he earlier revealed how he had been inspired by the world number 435’s triumph at Wentworth last Sunday.

“I said to my wife Lesley I played well at Wentworth but didn’t really hole a putt,” Khan added.

“She is pretty direct and said ‘It’s not going to get any better just sitting there talking about it’ so I got my putting track out on the carpet and hit about 300 putts that night.”