David Mathis watches his shot from the 10th tee box during Round One of the 2012 Travelers Championship at TPC River Highlands on June 21, 2012 in Cromwell, Connecticut.
(June 20, 2012 – Source: Jim Rogash/Getty Images North America)

CROMWELL, Conn. (AP) — David Mathis hoped to start strong at the Travelers Championship after missing the cut last week in the U.S. Open.

The 38-year-old Mathis birdied his first hole, then holed out from 158 yards on the par-3 11th hole. He knocked in a 49-foot birdie putt on his third, was at 6-under par after six holes, and fished with a 6-under 64 for a one-shot lead.

“It was an awesome start,” said Mathis, who has never finished better than eighth in a PGA Tour event. “I was hitting a lot of great shots (later), and I guess it felt like a lull compared to how I started.”

Nathan Green, Will Claxton and defending champion Fredrik Jacobson shot 65 on a day that saw temperatures soar into the upper 90s.

U.S. Open champion Webb Simpson and Masters winner Bubba Watson played together and finished in a group of 10 at 66. The third member of the threesome, PGA champion Keegan Bradley, shot a 68.

“We were relaxed all day,” Simpson said. “Bubba is my Presidents Cup partner. We always laugh together. And I’ve played a lot of golf with Keegan this year. He’s a good friend. We had a lot of fun feeding off each other, and luckily, we all played well.”

Mathis’ ace was the shot of the day. He said he was just trying to cut a nine iron close to the pin and hit it exactly where he aimed.

“It kind of bounced and stumbled right and went right in the hole,” he said.

Green teed off at 6:50 a.m., well before heat and humidity set in, setting the early mark with a 65. Claxton opened his round with a birdie and an eagle, but finished with a bogey on 18.

“To start out birdie-eagle, that’s huge,” Claxton said. “I obviously had the driver going. I drove the ball well today. It wasn’t as difficult as I thought it might be.”

Jacobson, who picked up his only PGA Tour win at the event a year ago, spent much of the day atop the leaderboard before a double bogey on 16 dropped him to 5 under and into a three-way tie for second.

“I knew it was going to be challenging in this heat, and if you start to miss a few shots, it can get to you,” he said. “So I was just happy to get through this day.”

One of Jacobson’s playing partner’s, former Masters champion Zach Johnson, also had a tough finish. He was 3 under when he hit a drive over the green at 15. He made a 6 there and a seven on the par-4 17th, where he tried to putt from the fringe, and needed three more after making it to the green.

A gallery of fans five and six deep greeted Simpson, Watson, and Bradley on the first tee, and many followed them throughout what all three said was a relaxed round.

“Any time you can play with those guys, it’s fun,” Watson said. “We learn from each other. We watch each other. We’re making some jokes out there. We were having a good time. It was good.”

But it wasn’t fun for everybody. Former UCLA star Patrick Cantlay made his professional debut with a 75 on the same course where he made headlines last year with a second-round 60 as a 19-year-old amateur.

“I started off poorly with a couple of doubles and couple weird things happened, and it just added up to a bad round,” Cantlay said.

MANULIFE FINANCIAL LPGA CLASSIC

WATERLOO, Ontario (AP) — Sandra Changkija birdied six of her final eight holes for a career-best 8-under 63 and a three-stroke lead during the suspended first round of the inaugural Manulife Financial LPGA Classic.

Play was suspended at 4:20 p.m. because of the threat of lightning in the area, and called off for the rest of the day at 6:30 p.m. Seventy-two players were unable to finish the round.

Changkija, making her eighth start in her rookie season, parred her first six holes after beginning play on No. 10, then birdied Nos. 16 and 18. With the wind picking up on the Grey Silo course, she birdied No. 2 and Nos. 4-8 for a front-nine 30.

China’s Shanshan Feng, coming off a major victory two weeks ago in the LPGA Championship, shot a 66.

Sweden’s Anna Nordqvist also was 5 under with five holes left.

Michelle Wie, trying to break out of a season-long slump, had a 70, breaking par for only the second time in 19 rounds this year. Second-ranked Stacy Lewis, a two-time winner this season, was 1 over with six holes left.

BMW INTERNATIONAL OPEN

PULHEIM, Germany (AP) — Australia’s Marcus Fraser and Paraguay’s Fabrizio Zanotti shot 8-under 64 to share the first-round lead in the BMW International Open.

England’s Chris Wood, Danny Willett and Ireland’s Paul McGinley were a stroke back at Gut Larcenhof. John Daly opened with a 68, and German star Martin Kaymer had a 71.