(CNN) -- Sweden's Henrik Stenson remained five strokes clear of his rivals before lightning stopped play for the day in Friday's second round of the Nedbank Challenge at the Gary Player Country Club at Sun City.
Stenson remains clear of his Sun City rivals after Friday's rain-affected second round.
Stenson followed his superb nine-under-par 63 by playing the first 10 holes of the second round in two-under-par -- although he is set to go six strokes clear with an easy birdie chance on the 11th hole.
"I was scrambling a bit more compared to yesterday," said Stenson.
"But I am playing well. I am not trying to defend a lead. If I can give myself enough birdie opportunities I can keep moving forward."
Stenson's nearest challenger, South African Rory Sabbatini, is also two-under for the day but he too had a birdie putt when the siren sounded and the players had to mark their balls and leave.
The biggest mover of the day was Korean KJ Choi, who was four-under after 12 holes to move to within two strokes of Sabbatini.
Choi had a run of three successive birdies which was halted by the suspension of play. But the Korean said he was not concerned about having his momentum interrupted. "I take it hole by hole and will go out tomorrow and start again," he added.
Choi, playing Sun City for the first time, said he understood the course better and said he felt relaxed after attending a sponsor's party at an artificial beach, followed by a good night's sleep.
"I started feeling good with my putter," he said. "I sank a few good putts to save par on the first nine and then I started making a few to make birdies."
Robert Karlsson is a further stroke back on a day when eight of the 12-man field played sub-par golf.
Conditions were made slightly easier after heavy overnight rain and the rain which followed the suspension of play on Friday was likely to make the greens more receptive.
Pre-tournament favourite Sergio Garcia is 10 shots off the pace after 12 holes, while defending champion Trevor Immelman seems out of contention at one-over after playing 13 holes.
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