Luke Donald stayed on track to become the PGA Championship's first European-born winner since 1930 by climbing into a tie for the lead after Friday's second round.
Donald shot a second successive four-under-par 68 to end a damp, overcast day at Medinah Country Club level with Swede Henrik Stenson and Americans Billy Andrade and Tim Herron.
"Any time you can play a major championship round without making bogey, you know you're doing something right," the 28-year-old Englishman told reporters after posting an eight-under total of 136.
"I have felt pretty comfortable playing this course the last few times I've played it."
The last European to win the year's final major was Britain's Tommy Armour at Fresh Meadows in 1930.
Donald, who plays mainly on the PGA Tour and has a house in nearby Chicago, believes he needs to raise his consistency at the game's highest level.
"I think I've got to the stage in my career right now where I should be competing and having a chance to win majors," he said.
"In previous majors, I've been getting a little ahead of myself, putting a little too much pressure on myself.
"At the British Open, I drove it poorly into a lot of bunkers and struggled there. U.S. Open I played great for the last 54 but struggled the first day."
Donald tied for 12th in the U.S. Open at Winged Foot in June before sharing 35th place in the British Open at Hoylake the following month.
"It's just trying too hard, really, is what I would put it down to," added the twice European Tour winner, whose best major finish was a tie for third on his debut at last year's Masters.
"This week I was determined to have a little bit more fun out there, dismiss bad shots really.
"It's nice to play well here and shoot a couple of good scores."