Louis Oosthuizen, the 2010 British Open champion, led the South African Open by a shot after a 9-under 62 in the first round on Thursday. Oosthuizen, playing his home Open for the first time in eight years, made a brilliant start at Randburg Golf Club in Johannesburg with nine birdies, including six in an eight-hole surge on the back nine, and no bogeys. "It was one of those rounds where you don't really look at any scoreboard or your card, you just play," he said. "I drove it really well and gave myself good opportunities to hit it close." Oosthuizen was one stroke ahead of Kurt Kitayama of the U.S., who won the Mauritius Open last weekend, and surprise challenger Madalitso Muthiya of Zambia.