Welcome to the U.S. Senior Open running updates. We'll update as the action dictates.
6:57 p.m. - Olin Browne capped off an impressive round with a par on No. 9, his 18th of the round. He shot 7-under 64 and leads Michael Allen and Mark O'Meara by two strokes. "Really it was a flurry near the end of the round," said Browne.
He also commented on his eagles.
"It's not just when you do it, but how you do it."
6:32 p.m. - Jim Thorpe made it into the clubhouse at 3-under 68. At the moment, he's tied for seventh. He took 30 putts in a round that featured six birdies and two bogeys.
"I thought the golf course played very, very fair," said Thorpe.
In the meantime, Olin Browne secured the outright lead with an eagle on No. 8. It was his second eagle of the round. He stands at seven under par.
6:01 p.m. - Olin Browne, with a birdie on No. 6, fell to five under and into a tie for the lead with Michael Allen and Mark O'Meara.Browne, 52, has two top-10 finishes in the U.S. Senior Open.This year on the Champions Tour, he started the season with five straight top-10 finishes.
5:35 p.m. - Mark Calcavecchia jumped to four under to join a slew of others who were on the number. The former British Open champion birdied the 12th and 13th holes, dropping in mid-range putts.
5:29 p.m. - Olin Browne eagled the par-5 fourth hole to get to four under. He went birdie-eagle on successive holes.
5:18 p.m. - With birdies on the third and fourth holes, Tommy Armour III climbed to four under par. He's tied with Steve Jones, who is in the clubhouse at 4-under 67, Peter Senior and Mark Wiebe.
4:57 p.m. - After peaking at six under par, Peter Senior has fallen back. He stands at four under through 14 holes. He bogeyed the par-4 11th hole and then the par-4 13th. Michael Allen and Mark O'Meara, both in the clubhouse, still lead at five under.
4:40 p.m. - Chien Soon Lu bogeyed the par-3 12th hole to fall to four under par. Mark Wiebe birdied the par-4 11th to get to four under, as well. Fred Funk (through 10 holes) and Tommy Armour III (through 12 holes) were both at three under.
4:28 p.m. - Peter Senior couldn't hold on to the outright lead as he bogeyed the par-4 11th hole. He's in a three-way tie at the moment.
4:16 p.m. - With a birdie on the par-4 11th hole, Chien Soon Lu fell to five under par, tying Michael Allen and Mark O'Meara, who were the clubhouse leaders.
4:05 p.m. - Peter Senior rolled in a 24-foot putt to get to six under par and assume the outright lead. He watched as the putt broke 2 feet to the left before dropping in. Senior finished sixth in last year's U.S. Senior Open. In 2010, he won the Austrailian PGA Championship at age 52.
4:03 p.m. - Peter Senior tied Michael Allen and Mark O'Meara, both of whom were in the clubhouse, at five under par. Senior birdied the par-4 ninth, running off three birdies in a row.
3:42 p.m. - Peter Senior and Chien Soon Lu dropped to four under par. Lu turned in a 4-under 33 on the outward nine. Senior had played eight holes.
3:33 p.m. - Fred Funk and Peter Senior joined Chien Soon Lu, Kiyoshi Murota and Mark Wiebe at three under par in the afternoon round. Steve Pate was in the clubhouse at 3-under 68.
3:04 p.m. - Mark Wiebe, Chien Soon Lu and Kiyoshi Murota carded three under pars. Lu had played the first seven holes of his round while Wiebe played six and Murota five holes. They trail leaders Michael Allen and Mark O'Meara by two strokes.
1:35 p.m. - Mark O'Meara's round didn't start the way he wanted. He missed an 8-foot putt fort birdie, but then strung together birdies on the next three holes.
He scrambled to make par on No. 17, saving par with a 22-foot putt.
"Any time you shoot five under in a championship - on this type of course - it has to please you," said O'Meara.
1:22 p.m. - Michael Allen said he's been working on his ball-striking this week. It paid off Thursday. On the second hole, he hit 3-wood off the tee, used a 9-iron on his approach shot and made the 20-foot putt for a birdie. On No. 4, he pitched from off the green to 4 feet and made that putt for birdie. And on the seventh hole, he used a 7-iron from 150 yards away from the flagstick and hit it stiff, to 6 feet, before making the birdie putt.
"I feel like I'm playing well," said Allen.
1:05 p.m. - Michael Allen and Mark O'Meara entered the clubhouse with the lead at 5-under-par 66. After a birdie on No. 10, O'Meara parred the rest of his inward nine holes.
12:42 - Damon Green, a caddie for Zach Johnson on the PGA Tour, carded a 4-under 67 to get into the clubhouse with the early lead. Green had eagled the par-5 fourth hole and birdied his eighth and ninth holes. He started on No. 10. Before caddieing for Johnson, he carried Scott Hoch's bag for four years.
"He taught me a lot about course management," said Green of Hoch.
Green may have to take a backseat to Mark O'Meara, who has continued to shoot five under par through 16 holes. The professional Michael Allen, one of two Michael Allen's in the field, also was holding steady at five under with one hole to play.
12:26 p.m. - A birdie on the par-4 seventh hole the professional Michael Allen into a share of the lead with Mark O'Meara, at five under par. Damon Green and Dana Quigley stand at four under par.
11:51 a.m. - Past U.S. Senior Open champion Bruce Lietzke withdrew after playing 13 holes. He was eight over par. Lietzke had said that he had been bothered by a shoulder injury on Wednesday. No word yet if that was the reason why he withdrew.
11:40 a.m. - Michael Allen birdied the par-5 fourth hole to get to four under. In the meantime, Steve Jones bogeyed the par-4 11th hole to fall back to three under par.
11:26 a.m. - Steve Jones birdied the par-4 10th hole to inch closer to leader Mark O'Meara. Jones was four under par, one stroke behind O'Meara.
11:18 a.m. - Mark O'Meara birdied the par-4 11th hole to fall to five under par. The birdie allowed him to open up a two-shot margin on Michael Allen, Ronnie Black, Steve Jones and Dana Quigley. His fifth U.S. Senior Open appearance, O'Meara's best finish came in 2009 when he tied for sixth.
11:07 a.m. - A birdie on the par-4 10th hole dropped Mark O'Meara to four under par. He holds the outright lead. Amateur Michael Allen, Steve Jones and Dana Quigley trail O'Meara by one shot.
10:51 a.m. - Steve Jones, the 1996 U.S. Open champion, went to three under after birdieing two of his last four holes. He birdied the par-4 sixth and then birdied the par-5 eighth hole.He is playing in his first U.S. Senior Open.
10:41 a.m. -Michael Allen shot a 32 on his first nine holes. He started on No. 10.
10:25 a.m. - Jim Chancey suffered a bogey on the par-4 fifth hole to drop back. He's tied with four others at two under par.
10:05 a.m. - With a birdie on the par-5 fourth hole, Jim Chancey grabbed a share of the lead at three under. Dana Quigley also moved into a tie with Mark O'Meara after birdieing the par-5 fourth hole. Quigley is playing in his 12th U.S. Senior Open, his best finish coming in 2005 when he tied for ninth.Quigley is bouncing back from an injury-marred 2009 and 2010. He underwent surgery in 2009 to repair two tears in his left shoulder. In 2010, he only made 10 starts due to injury.
9:22 a.m. - Mark O'Meara broke away from the pack and birdied the par-5 fourth hole to grab the outright lead at three under par.
9:18 a.m. - Amateur Dave Baskins toppled out of the lead with a bogey on the par-4 sixth hole. He's playing in his first U.S. Senior Open. Amateur Mike Allen, Mark O'Meara, Jerry Pate and Mark O'Meara lead the championship.
9:11 a.m. - Jerry Pate, the 1976 U.S. Open champion, moved into a tie for the lead after birdieing the par-5 fourth hole. He's tied with four others at the top of the leaderboard.
9:03 a.m. - Amateur Mike Allen, who shot 69 at the Kingwood, Texas, sectional, birdie the 10th and 12th holes to equal amateur Dave Baskins, Hal Sutton and Mark O'Meara at the top of the leaderboard.
8:57 a.m. - Mark O'Meara grabbed a share of the lead with birdies on the second and third holes. O'Meara, who has two Champions Tour victories, is playing in his fifth U.S. Senior Open.
8:46 a.m. - Fifty-eight-year-old amateur Dave Baskins went to two under par on the par-5 fourth hole. His first USGA event was the 1973 U.S. Amateur at Inverness Club, where he lost in the third round of match play.
Hal Sutton also got to two under with a birdie on the par-3 second hole.Sutton is playing in his third U.S. Senior Open.
8:37 p.m. - Ten players are now at one under par. Meanwhile, Craig Stadler withdrew from the championship due to an injury to his lower back. The alternate who will take his place is Jon Chaffee of Scottsdale, Ariz., who competed in sectional qualifying on June 27 at Arrowhead Country Club in Glendale, Ariz. Chaffee shot 69 to earn the first alternate position.
8:21 p.m. - Mike San Filippo, amateur Dave Baskins, Ronald Spittle and Jerry Pate all stood one under par to open up the championship.