Branden Grace's charge up the leaderboard at the SA Open was halted by stormy weather Friday with play abandoned midway through the second round.

The South African was tied for the lead with Keith Horne at 8 under, after going through 11 holes in 5 under, when play was called off for the day at Glendower Golf Club because of the threat of lightning.

Horne held the clubhouse lead after shooting a 3-under 69 to follow up his first-round 67.

Eleven of the leading 13 players are from South Africa.

Jbe Kruger is a shot behind after a 70. Justin Walters (70), Brandon Stone (67) and Ross McGowan (70) were at 6-under 138 after two rounds.