( CNN ) -- Louis Oosthuizen successfully defended his Volvo Golf Champions title in Durban Sunday despite still feeling the effect of injuries which have derailed his career . The South African won the 2010 British Open at St Andrews and lost a playoff to Bubba Watson at the 2012 U.S. Masters but injuries ruined his challenge in the majors last season . All that was forgotten as he won on home soil for the fourth year running and extended his record of claiming a title on the European Tour every year for the last five . A run of four birdies in the last six holes saw him card a final round 68 for 12-under , one shot clear of compatriot Branden Grace and two ahead of Dutchman Joost Luiten and third round leader Tommy Fleetwood of England . Oosthuizen is hoping he can take a well-deserved break and go into the first major of the season in Augusta in good shape . `` I 've got three weeks now that I really need to work on my back , '' Oosthuizen told the official European Tour website . `` It 's still not 100 per cent . Luckily this week I did n't have to hit a lot of drivers , but once I get to Augusta I need to hit driver , '' he added . Grace birdied the final hole to put Oosthuizen under pressure , but he responded superbly with two birdies of his own to finish . `` I saw that Branden had made birdie on 18 so I knew that second shot was crucial to give myself a good opportunity and I hit it really close , '' he said . `` And then 18 , everyone thinks you just need to make a birdie but around that green it 's not easy and luckily I was far enough past where I could pitch it back into the grain and get it close . '' 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 Volvo Golf Champions event in South Africa . Successfully defends title in Durban . Birdies four og the last six holes to pip compatriot Branden Grace . Oosthuizen won British Open at St Andrews in 2010 .