Wallie Coetsee took a one-shot lead at the Joburg Open after a 6-under 65 on Friday put him 12 under par and at the front of a group of South Africans.

Coetsee leads from Garth Mulroy and Tjaart van der Walt, with England's Simon Dyson also tied for second at 11 under.

Coetsee opened with a 66 on the tougher, par 72 East Course on Thursday, and took his strong form onto the par 71 West Course in the second round.

Coetsee had three straight birdies to start and finished with five birdies and an eagle in all, and just one bogey.

Mulroy carded a 68 and Van der Walt a 69 on the East Course. Dyson, also on the East, had six birdies and a bogey in his 67.