Bryce Molder enters the weekend's running at the DEAN & DELUCA Invitational with a one-shot lead, despite not completing his second round.
Adverse weather conditions curtailed play for the second day running at Colonial, with Molder only able to get through 15 holes before play was halted due to darkness.
Sitting on nine-under, Molder is one clear of Webb Simpson, with world number Jordan Spieth and Patrick Reed two off the pace. India's Anirban Lahiri is a further shot adrift.
The start of the round was delayed by some five-and-a-half hours due to overnight thunderstorms that lingered in the morning.
Molder was only out on course at 18:00 on Friday, but made the most of what time he had, taking the turn in 30 courtesy of five birdies. A double bogey-six at the par-four 12th halted his progress somewhat before he was forced into the clubhouse by darkness.
Simpson backed up his opening 65 with a round of 67 that included four birdies and a lone bogey at the seventh.
The Fort Worth crowd would have been hoping for a strong showing from local lad Spieth, and the two-time major winner didn't disappoint, posting a 66 that included four birdies in six holes to start his inward nine.
Reed is well placed after playing just eight holes of his second round, the American notching up two birdies before his day was brought to a premature end.
Lahiri endured an eventful 12 holes, some of which he would like to forget. Lighting-quick out of the blocks, the Indian number one eagled the first and birdied the second before slumping to four bogeys and just one more birdie over his opening nine. A birdie at the 10th then lifted him to six-under.
With more than half the field yet to complete their second rounds, play will begin at 7:30 local time.
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