Branden Grace increased his lead to five strokes after a 6-under 66 Friday in the second round of the Alfred Dunhill Championship.

The South African had three birdies on the front nine and another four after the turn at Leopard Creek Country Club to move to 16-under 128 overall.

Francesco Molinari (65) had the low round to move into second place. Tjaart van der Walt (67) is a shot behind Molinari.