Five players hold the clubhouse lead after shooting 5-under 67 on Thursday in the incomplete first round of the fog-affected Ballantine's Championship, with former British Open champion Louis Oosthuizen a stroke back with two holes to play.
Jean Baptiste Gonnet, Johan Edfors, Kieran Pratt, Matthew Baldwin and Kim Gi-wang are leading after fog engulfed the Blackstone course to force a delay of 2 hours, 10 minutes, leaving half the field to complete their rounds early Friday when bad light stopped play.
Oosthuizen, who won the 2010 British Open at St. Andrews, topped the leaderboard at 6 under before dropping two strokes on his back nine.
The South African is the highest ranked player in the field at No. 7. He started his round by making four straight birdies, including holing a 20-foot putt at the fourth, but two further birdies were offset by two bogeys.
Edfors was leading at 5 under after 10 holes when play was halted, and he failed to regain his early momentum.