South Africa‘s Louis Oosthuizen remains a firm favourite to win the Open Championship after a third-round 69 gave him a four-shot lead over the field (Oosthuizen 8/11 to win Open).

The 27-year-old led by five shots after round two and he now sits on 15-under par at St Andrews, with England’s Paul Casey the nearest challenger on -11 after his third-round 68 (Casey 5/2 to win Open).

Highly-rated German star Martin Kaymer (12/1) is on eight-under par, while Lee Westwood, Alejandro Canizares and Henrik Stenson are a further shot back with one round to go at the home of golf.

But the tournament is now Oosthuizen’s to lose after rounds of 65, 67 and 69 and the youngster is looking forward to the final day of the year’s third major.

“I was nervous at the start but made a few putts to calm my nerves,” he told BBC Sport. “I’m playing nicely and I feel very confident out there.”

Westwood has been a consistent performer at the majors in recent times, finishing tied for third at last year’s Open and PGA Championship, before a runners-up spot at this year’s Masters and a top 20 finish in the US Open.

The Englishman has eight shots to make up on the lead and acknowledges that it will be tough to overhaul the frontrunners on Sunday afternoon.

“It can be done,” he said. “But, having seen the way Louis and Paul Casey played today, it will be very tough.”

Tiger Woods will have to wait a little longer for his next major as he sits on -3 and a 12-shot deficit will be hard to overcome with just one round to go, even for the world’s number one player.