Lodewicus Theodorus \"Louis\" Oosthuizen (born 19 October 1982) is a South African professional golfer. Oosthuizen was born in Mossel Bay, South Africa. In 2000 he was a member of the South African team that won the World Amateur Team Championships. He won numerous amateur titles before turning professional in 2002 at the age of 19. He has won five professional tournaments on the Sunshine Tour, the 2004 Vodacom Origins of Golf at Arabella, the 2007 Dimension Data Pro-Am and Platinum Classic, and the Telkom PGA Championship twice, in 2007 and 2008. He played on the European Challenge Tour in 2003 and has been a member of the European Tour since 2004. He has featured in the top 50 of the Official World Golf Rankings.
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