AVONDALE, La. — Jason Dufner is in familiar territory atop the leaderboard after 36 holes.

It’s the weekends that have given him fits.

Dufner moved into position for another bid to win his first PGA Tour title, shooting a 7-under 65 on Friday to take the second-round lead in the Zurich Classic.

The former Auburn player has had at least a share of the 36-hole lead in two of his past four tournaments, including the Masters, where he closed with consecutive 75s. He’s second on the tour in pre-cut scoring, but 98th in third rounds and 108th in final rounds.

“It’s been a difficult weekend for me the past month and a half or so,” Dufner said. “I haven’t quite played as well as I would have liked, but I know that my game is still pretty good.

“I’ve been trying to think about what I can do better mentally, what I can do better emotionally out there and learn from some things that I maybe struggled with. Obviously, there’s a lot of different things that go into winning besides hitting the golf ball.”

Dufner lost a playoff last year to Mark Wilson in the Phoenix Open and Keegan Bradley in the PGA Championship for two of his three runner-up finishes in 163 starts on the PGA Tour.

On Friday, he capped his bogey-free round with a 30-foot eagle putt on the par-5 18th to reach 12 under.

“I had a couple of easy birdies,” Dufner said. “I don’t think I missed a fairway or a green. Just had some tough reads. The greens are kind of tough to read. Sometimes you get competing grains, competing slopes, so you get a putt that might break to the right, but the grain is going left. That can be kind of difficult to judge. Then 18, I had just a really good number for my 5-wood to get somewhere on that green and had a putt that was down grain and breaking to the left with the grain, so that was a nice way to finish the day.”

PGA Tour rookie Russell Knox, John Rollins and first-round co-leader Ken Duke were tied for second. Knox shot a career-best 64, Rollins 66 and Duke 68.

Greg Chalmers holed out for an eagle on the par-4 first and also finished with a 64 to join Steve Stricker and Ernie Els at 10 under. Stricker and Els shot 68.

Knox and Chalmers matched the course record.

Defending champion Bubba Watson had his second consecutive 71 to make the cut on the number at 2 under in his first tournament since his playoff victory in the Masters.

Second-ranked Luke Donald rebounded from an opening 73 with a 65 to reach 6 under. Donald, tied for 22nd, needs to finish sixth or better to regain the top spot in the world from Rory McIlroy.

Knox, a Nationwide Tour graduate playing in his ninth tournament, had seven birdies and an eagle — on No. 18 — along with one bogey.

Stricker had four consecutive birdies beginning on the seventh to move into a tie with Dufner, then missed a 2-foot birdie putt on the 11th that would have given him sole possession of the lead. Stricker stumbled home with bogeys on the 12th and 15th.

“I played really solid all the way through 11 and then missed that putt and kind of lost my thought process there for a little bit,” Stricker said. “Felt like I let a really good one slip away today.”

Watson, away from his wife and recently adopted son after taking a two-week break following the Masters, eagled the seventh and birdied the eighth, but bogeyed the 10th when he missed the green from 47 yards on his approach. He also three-putted the 12th for another bogey, moving him to 1 under, one above the cut line.

“Mentally, I’ve lost focus just about every shot, so I’m trying to figure it out,” Watson said. “I want to be home with my son and wife. I know it sounds like a cop-out but I’m not playing very good because I’m just really not into it.”

Watson also struck a fan in the head with a hooked drive.

Watson’s tee shot on the second hole at the TPC Louisiana drew blood from the back of Radd Leonard’s head.

Leonard, who was reached quickly by medics, said he was fine and found it incredible that he was hit in the head by the very player he came to see. The 52-year-old motorcycle shop owner from Baton Rouge also was glad he was able to help Watson back into the fairway, where the ball landed after striking him.

“I saw it coming and it looked like it was hooking right at me. I wanted to see that big hook, you know, and I got to see it. I turned and ducked and it still hit me,” Leonard said. “It gave him a good bounce, anyway.”

Also on Friday:

Lewis takes lead in Mobile

MOBILE, Ala. — Stacy Lewis birdied five of her final nine holes for a 5-under 67 and a one-stroke lead after the second round of the Mobile Bay LPGA Classic. Lewis, the Kraft Nabisco winner last year, had three straight birdies and a two-stroke lead, but missed a 5-foot par putt on the final hole en route to her first bogey of the week. She had a 9-under 135 total on The Crossings course at the Robert Trent Jones Golf Trail’s Magnolia Grove complex. Karin Sjodin tied the tournament course record with a 64 to finish a stroke back along with Lindsey Wright, So Yeon Ryu and rookie Sydnee Michaels.

Austrian up one in S. Korea

SEOUL, South Korea — Austria’s Bernd Wiesberger shot a course-record 7-under 65 to take a one-stroke lead over Australia’s Marcus Fraser after the second round of the Ballantine’s Championship. Wiesberger had a 7-under 137 total on the Blackstone course in the event sanctioned by the European and Asian tours. Fraser, the 2010 Ballantine’s champion, shot a 67.