The drawing board beckons for Vijay Singh after the world number three's Open challenge sank without trace at Royal Troon.

Much had been expected of the Fijian coming into the tournament but a crippling five-over round of 76 on Saturday all but ended his chances of success.

Singh, who finished tied for second at last year's Open, fared marginally better on the final day with an level-par 71 but it did little to cheer the two-time major winner.

"I'm disappointed. I'm extremely disappointed with the way I played yesterday and a few holes today," said Singh, who admitted he had a lot to ponder ahead of next month's USPGA Championship, a tournament he won in 1998.

"I don't know, I just have to go and rethink what I need to do. You can't be making so many simple mistakes in majors.

"And I have to fix my putting," he added.

"I feel like I'm putting well but the balls are not going in - so I can't be putting well.

"Putting is just another of those hiccups. If you don't make so many mistakes off the tees and on the fairways, you'd be okay. But I need to make more putts."

Singh has been in inspired form on the USPGA tour this year - winning three tournaments - and looked well-placed at the halfway point of the Open.

At three-under par, he was tied for fourth place and just two shots off joint leaders Paul Casey and Thomas Levet.

It all went horribly wrong on day three, though, and Singh is determined to avoid a repeat performance at the USPGA.

"I'll have a rethink, I have two weeks out of the next three off before the major and I want to arrive at Whistling Straits ready.

"I don't want to arrive and feel like 'maybe, maybe not'. I want to arrive there totally ready."