Lodewicus Theodorus "Louis" Oosthuizen (Afrikaans pronunciation: [ˈlu.i ˈuəstɦœyzən]; born 19 October 1982) is a South African professional golfer who won the 2010 Open Championship.

His early career was supported financially for three years by the foundation of fellow South African golfer Ernie Els.

[14] On Sunday, Casey closed the gap to three shots on the 8th hole, before Oosthuizen drove the 9th green and made a long putt for eagle.

Oosthuizen said that his exemplary focus during the tournament, which enabled him to win by a wide margin, was due to a red spot marked on his glove.

Oosthuizen had consulted Karl Morris, a Manchester-based sports psychologist, prior to the event for ways in which he could improve his concentration.

In January 2011, he claimed his third European Tour title, and his sixth in his home country, winning the Africa Open in a playoff.

[20] In 2012, Oosthuizen successfully defended his title at the Africa Open with a two stroke victory over Tjaart van der Walt.

In the second event of the 2012 PGA Tour FedEx Cup Playoffs, the Deutsche Bank Championship, Oosthuizen held the 54-hole lead by three strokes and came close to his first victory on US soil, finishing second to Rory McIlroy by one shot.

On 13 January 2013, he won the Volvo Golf Champions, shooting a six-under-par 66 final round to win the title by one stroke.

In December 2019, Oosthuizen played on the International team at the 2019 Presidents Cup at Royal Melbourne Golf Club in Australia.

[26] In July, Oosthuizen finished in a tie for third place at the 2021 Open Championship at Royal St George's Golf Club in Sandwich, Kent, alongside Jon Rahm and behind Jordan Spieth and winner Collin Morikawa.

1Cancelled due to COVID-19 pandemic QF, R16, R32, R64 = Round in which player lost in match play NT = no tournament "T" = tied Note that the HSBC Champions did not become a WGC event until 2009.