David Frost of South Africa shot a 6-under-par 66 Friday to move from seventh place to the lead after two rounds of the South African Open.
Frost reeled off four birdies on the front nine and three more on the back nine. He is at 134.
Countryman Ernie Els, who shot 64 on Thursday, had a par-72 Friday and is two shots back at 136. He holds two South African titles.
Australian Greg Chalmers was third with 137 at the halfway mark of the tournament.
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