Carmel, IN (My Sportsbook) - Drawing energy from a supportive gallery, Tim Jackson tied the 36-hole scoring record Friday at the U.S. Senior Open.

Jackson, a 50-year-old amateur from Germantown, Tenn., shot a five-under 67 at Crooked Stick and moved to 11-under-par 133 for a one-stroke lead over Joey Sindelar.

He tied six other players for the Senior Open's 36-hole mark, including Tom Watson, Loren Roberts and Craig Stadler, who were the last to post 133 at NCR Country Club in 2005.

"These last two days have been the best for me," said Jackson, who is trying to become the first amateur winner in Senior Open history.

Sindelar tied Jackson for the lead, but bogeyed his 16th hole to shoot a 68 and fall one stroke back at 10-under 134. Fred Funk (67) had third place at nine-under 135, with Greg Norman (70) another shot further back at eight-under 136.

Jackson, who shot a 66 on Thursday, has now posted two scores better than the previous amateur record (68) for this championship.

The former full-time accountant -- he's done private equity investing, focusing on real estate, the past 10 years -- was taking plenty of time to enjoy his situation.

"Just having my son caddying and the family here, it's been very special, regardless of what happens the rest of the week," said Jackson. "These memories of the last couple of days and the fans pulling for you is just wonderful."

Jackson may be a surprise leader, but he is no stranger to championship golf.

A veteran of more than 35 USGA championships, Jackson won the U.S. Mid-Amateur twice, in 1994 and 2001, and reached at least the quarterfinals of that championship six times.

He twice reached the quarterfinals of the U.S. Amateur, including in 2004, when he lost to eventual champion Tiger Woods.

Well credentialed in his home state, where he has won multiple amateur championships and is the president-elect of the Tennessee Golf Association, Jackson is also a member at several high-profile courses including Colonial and Hazeltine.

Seemingly feeling right at home on another championship course, Jackson started his second round at Crooked Stick with a birdie at No. 1. But he didn't really make his move until the back nine, where he posted five birdies and a bogey for an inward 32.

The last nine holes were a blur, Jackson said.

"I think I got out there today, had a lot of comfortable yardages, and when I hit a shot that wasn't where I was looking, I was able to miss it on the correct side and get away with it," he said.

Jackson's lone bogey Friday came at the par-four 16th, where he hit into the face of a bunker. Shaking off the urge to do something more with his next shot, Jackson played it safe and took his medicine.

"I was actually proud of myself for just being disciplined there and not trying to reach for too much," he said.

Sindelar tied Jackson at 11-under with a birdie at No. 6 -- his 15th hole -- but he took a bogey at No. 7 to fall one back, giving Jackson the dream position of carrying a lead into the weekend at a major championship.

He is on pace to obliterate the amateur 72-hole scoring record of 288 set by Greg Reynolds and George Zahringer in 2005.

One thing at a time, however. Jackson, who plans on remaining an amateur, said his mind was on Saturday's third round.

"Tomorrow is going to be a different animal, I'm sure," he said. "I'm playing toward the end tee times, and the hardest thing is killing time ahead of that and trying to get your mind off of it and not be too stressed out.

"I'm going to be nervous, I know that. I just have to keep focused on my routine and literally, I know this is cliche, but just one shot at a time."

Dan Forsman (71) held fifth place at seven-under 137 and was followed by Robin Freeman (68), Tom Lehman (70) and Bruce Vaughan at 138. Roberts (71) led a four-way tie at 139.