Louis Oosthuizen remembers the day well. It was at Mossel Bay Golf Club in 2002. It was the day he shot 57.
"I played with two of my friends and won 27 skins that day. They weren't very happy with me. It was a strange day. I made birdies at my first three holes and shot 29 on the front nine. I hit it close on 13 but missed the eagle putt. Then on 14 I hit it in the bush and thought, okay, that's it. It's over. But I found my ball, made par, and then finished with three birdies and an eagle."
It's been the pattern of Oosthuizen's career that when he is on form he is capable of making the best in the world look very ordinary, but by his own admission his form is somewhat streaky.
Oosthuizen had missed the cut in the previous three Open Championships he'd played in before he won in such spectacular fashion at St Andrews in 2010, beating Lee Westwood by seven strokes.
He'd also missed the cut in his first three Masters before finishing second in 2012 when he lost in a playoff with Bubba Watson.
But a Major, 11 professional victories, a Presidents Cup debut in 2013 and a career high ranking of fourth in the world have done little to affect the humility of a man who is as down to earth as the fields he ploughs on his farm in Gouritsmond near Mossel Bay, and using the John Deere tractor he bought with his Open winnings.
Oosthuizen's talent was quickly spotted as a boy when he was brought into the fold of the Ernie Els & Fancourt Foundation.
He went on to claim some memorable victories on the Sunshine Tour, the best of which came in the 2008 Telkom PGA Championship at Country Club Johannesburg. He won by 14 shots with a score of 28-under-par 260, including rounds of 66, 63, 66 and 65. It was the biggest 72-hole winning margin in the history of the Sunshine Tour. Oosthuizen also came close to matching the biggest victory in relation to par in the history of the Sunshine Tour, which was Mark McNulty's 29-under 259 in the Royal Swazi Sun Pro-Am at the Royal Swazi Sun Country Club in 1987.
"I just played so well that week. Those were probably the four best rounds of my career. It was just one of those weeks where you can do no wrong."
The 2012 Masters was building towards a fairy-tale ending for South Africa as Oosthuizen worked his way into a lead, with 2011 champion Charl Schwartzel ready to slip the green jacket on him.
In a dramatic final round at Augusta National Golf Club, Oosthuizen hit a four-iron from 253 yards and which pitched on the front of the green and rolled into the hole for the first albatross on the second hole.
But Watson went on to produce a miraculous shot in the playoff that beat Oosthuizen.
This year Oosthuizen started in spectacular fashion when he won the Volvo Golf Champions in Durban and climbed to a high of fourth in the world. But a recurrence of an old neck injury caught up with him and forced him to withdraw in the first round of the Open Championship. He was sidelined from the game for a large part of the season, returning just in time to make his Presidents Cup debut.