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.
The 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).
The triple major winner Padraig Harrington scorched back to the clubhouse in 31 over the closing nine holes and his 67 placed him joint-fifth at eight-under with Italian Francesco Molinari (68).
