Afternoon storms forced a suspension of play for almost two hours and 36 players were unable to complete the round.
The co-leaders were at 5-under 139 and it appeared that when the cut is made on Saturday, no one playing on the weekend will be more than six shots off the pace.
John Riegger and Neal Lancaster were also at 4-under, but neither had completed play and both had a chance to share the lead when the second round is completed early Saturday.
After shooting a 75 Thursday, John Daly rallied with a 70 to make the 36-hole cut.
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