Defending champion Zach Johnson, Lucas Glover and rookie Patrick Reed are tied for the lead following second-round play Friday at the John Deere Classic.
Johnson shot a 5-under 66 to maintain a share of the lead for the second day in a row.
Reed shot a 63 in the morning session, just one year after missing the cut at TPC Deere Run, while Glover finished at 9 under on Friday.
Australia's Matt Jones is a shot back at 11 under. Troy Matteson leads a pack at 10-under, while three-time winner Steve Stricker is among those at 9 under.