By Michael Todt DURBAN, Jan 12 (Reuters) - Britain's Scott Jamieson capitalised on a rare bad round from 2010 British Open champion Louis Oosthuizen with a four-under-par 68 to seize a five-stroke lead in the Volvo Golf Champions on Saturday. Second-round leader Oosthuizen's poor front nine of 40 on his way to a 74 left him in a three-way share of second at 10-under (206) with Frenchman Julien Quesne (67) and Thongchai Jaidee (73).