Venezuelan Jhonattan Vegas carded a flawless 62 to take a one shot lead at the halfway point of the John Deere Classic.
Vegas, who has three PGA Tour wins to his name, notched up two lots of two consecutive birdies to reach the turn on five under and picked up a further four shots on the front nine.
It followed a 67 on the opening day and puts him on 13 under for the tournament, ahead of Americans Andrew Landry who scored 65 for 12 under and Lucas Glover whose 64 puts the 2009 US Open champion third on 11 under.
Ireland's Seamus Power played himself into contention with a fine round of 65 that saw him climb to within five shots of the lead.
An eagle on the 14th started Power's late rally and he went on to claim birdies on the final three holes.
Another big mover on Friday was American Harold Varner III whose 65 pushed him into a tie for fourth place, alongside Russell Henley and Daniel Berger, both of the US.
Scot Martin Laird mixed five birdies and three bogeys in a round of 69 and is among 14 players tied in 11th place, including Power.
England's Luke Donald is two shots further behind and tied for 32nd. 130319