Jaco van Zyl shot a 7-under 65 Thursday to top a South African-dominated leaderboard in the first round of the SA Open, the European Tour's first event of 2016.

Van Zyl maintained the form that put him in ties for eighth and 13th at the season-opening Alfred Dunhill Championship and Nedbank Golf Challenge before Christmas, hitting six birdies and an eagle.

Shaun Norris was alone in second place after a 66, and Jbe Kruger and Keith Horne were tied for third at 5 under at Glendower Golf Club.

Defending champion Andy Sullivan of England shot 3 over and was 10 strokes off the pace.

Play was suspended for the day because of the threat of lightning, with 33 players still to finish their rounds.