Ooshuizen, the 2010 British Open champion, birdied three of his final four holes at the East London Golf Club in South Africa and was tied with Tjaart van der Walt heading into Sunday's deciding round.
Ooshuizen, who shot 62 Friday, began Round 3 with three consecutive birdies and ended with only one bogey.
Van der Walt also got off to a fast start with six birdies and a bogey on the front nine.
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