Behind the title contenders , Ireland 's Padraig Harrington , who has not won on the European Tour since his 2008 U.S. PGA triumph , came through the field with a 67 to finish tied fifth at nine under . Louis Oosthuizen wins World Golf Champions event in South Africa . Successfully defends title in Durban . Birdies four og the last four holes to beat qualifier Branden Grace . Grace won British Open at St Andrews in 2010 .
Louis Oosthuizen wins World Golf Champions event in South Africa . Successfully defends title in Durban . Birdies four og the last four holes to beat qualifier Branden Grace . Grace won British Open at St Andrews in 2010 .