STORY HIGHLIGHTSFormer British approachable champion Louis Oosthuizen leads Africa approachable by the side of halfway stageDefending champion cards 11-under 62 in support of 15-under 131 by the side of East LondonFour-strong South African chasing put together two shots behindRyder Cup star Paul Casey dislocates shoulder while snowboarding taking part in U.S. Defending champion Louis Oosthuizen raced to the halfway pilot next to the Africa amenable with a superb 11-under-par 62 next to East London Golf union Friday.It was perfectly solitary shot outside Richard Sternes run longest and gone the 2010 British set off winner on 15-under 131 two tidy up of a four-strong chasing bundle.With compatriots Jaco Ahlers, Thomas Aiken, Retief Goosen and Tjaart advance guard der Walt on 13-under 133, it proverb an all-South African top five by the European Tour event.The 29-year-old Oosthuizen, who in progress on the 10th, accomplished his front nine at home four-under 32.