In the end, his final-round 73 was the product of tiredness and it cost him the chance of victory, but Louis Oosthuizen still managed a fourth place in the Scandinavian Masters in Sweden at the weekend.

There were signs that his steely focus was slipping in the third round when a wayward tee shot was greeted with the first expression of frustration he had show in two weeks.

And when his final round started out with three bogeys on the opening five holes, it was apparent he was in for a tough day at the office.

He dragged back two of those shots with birdies on 12 and 13, but another bogey on 16 sank his chances.

He finished with a flourish with a birdie on 18, and his share of fourth was just three shots off the winner, Richard S. Johnson, the popular hometown player who sank a 30-footer for birdie on the 18th to deafening cheers to defeat Rafa Echenique of Argentina.

Oosthuizen gave himself a real shot at winning, and, in the process made himself a lot of fans who would have forgiven him had he pleaded fatigue after his Open Championship victory instead of admitting he was drained a week later.

“I definitely wanted to go for it but I didn't drive well enough and it put everything else under pressure,” he said. “Tiredness affected my focus.”

On the other side of the Atlantic, Tim Clark also had a share of fourth in the Canadian Open after Swede Carl Petterson rode his third-round resurrection – he fired a 10-under 60 after nearly missing the cut – all the way to victory.

His final-round 67 saw him surge past a hapless Dean Wilson whose three consecutive 65s had seen him into a seemingly commanding position after round three. However, his closing 72 let Petterson through.

Clark fired a one-over 71 in the last round to share fourth with eight other players, while Trevor Immelman had another solid week after his Open Championship performance, with his one-over 71 seeing him finish one shot behind Clark in a share of 13th.

And, in the Senior Open Championship at Carnoustie, David Frost shared 14th behind Bernhard Langer, who held off Corey Pavin in a tough final round.

Frost, who was beaten in a playoff by Tom Lehman in the US PGA Senior PGA Championship in his first attempt to win a senior major was not the leading Southern African player: Trevor Dodds of Namibia finished alone in seventh.