Andrew Loupe was on top of the leaderboard when the first round of the John Deere Classic was suspended due to darkness on Thursday evening.

Bad weather had caused a lengthy delay during the day, and several players were still out on course when darkness fell.

Loupe had just completed the 14th hole, and moved to eight under par after making the turn at five under and then picking up shots on the 11th, 13th and 14th holes.

That put him two shots clear of Patrick Rodgers, Ryan Moore, and Zach Johnson - all back in the clubhouse after rounds of 65 - as well as Tom Gillis who was on 16 under after reaching the 16th hole.

Rodgers had been on one under at the turn, but had three birdies in a row on the 11th, 12th and 13th holes before picking up further shots on the 15th and 18th holes.

Johnson, starting on the back nine, had four birdies in five holes before making the turn, and then picked up shots on the second and sixth holes.

"It was pretty mistake-free until the last couple of holes," he said on the PGA Tour website. "I didn't have any really difficult saves until the eighth and ninth, the last two holes I played.

"I know I can score well here but if I come here expecting that there's no chance, I've still got to keep the pedal down."

Moore's round was highlighted by an eagle on the par-five 17th.

"It's just one of those courses I like a lot," the 33-year-old said. "I like a lot of the tee shots, I'm very comfortable with the whole course set-up. I really like the greens, they are some of the purest greens we play."

Geoff Ogilvy started with six birdies in his first eight holes, but after making then turn he dropped a shot on the first hole and was on five under after 12 holes when play was suspended.