EAST LONDON, South Africa (AP) _ After dropping five shots, first-round leader Hennie Otto of South Africa rallied to retain the lead after the second round of the South African Open Friday.

Otto shot a 4-under 70 for a 9-under 135 total on the East London Golf Club course.

Countryman Roger Wessels, who led for much of the day after shooting a 69, wound up one stroke back, tied with England's Greg Owen.

Owen birdied the 16th for a share of the lead, but bogeyed the 18th, finishing with a 69.

Otto, starting on the back nine, double-bogeyed the 15th and fell to fourth place. Three more bogeys after his first 11 holes dropped him to 4 under. But birdies at the second, third, fourth, sixth and seventh holes catapulted him back into the lead.

Darren Clarke of Northern Ireland, the world No. 11, missed the cut at 155 after a second-round 78.