(CNN) -- Scotland's Richie Ramsay added a second-round 67 to his opening 68 to lead by one stroke at the halfway stage of the Wales Open at Celtic Manor on Friday.
Ramsay followed his opening 68 with a second round 67 to lead the Wales Open by a single shot.
European Tour rookie Ramsay lies on 135 (-7), just ahead of English pair Robert Rock (68) and Ross Fisher (66), with a further four players another shot behind on a congested leaderboard.
Rock was the runner-up in the recent Irish Open to amateur Shane Lowry, while Fisher was second to Paul Casey in the BMW PGA Championship.
Meanwhile, European Ryder Cup captain Colin Montgomerie is in contention going into the weekend's action, after a second successive 69 left him on four-under-par, just three strokes off the lead.
"I was quite happy to finish with a 69 to be honest," the veteran Scot told reporters. "It's not an easy course. This is quite difficult, a big course.
"It could have and should have been better, but I am learning to accept what I get because of what the last year has been like."
Corey Pavin, the U.S. Ryder Cup captain who is here to get an early look at the Celtic Manor course that will host the transatlantic match next year, had a second successive 72 and only just made the cut. "I think I hit only one fairway in the first 10 holes," Pavin complained.