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Hilton Head Island, S.C. โ€” Little-known Troy Merritt one-upped the Masters champion Jordan Spieth at the RBC Heritage.

Merritt shot a 10-under 61 on Friday to tie the course record at Harbour Town Golf Links only a few hours after Spieth wowed the gallery with a bounce-back 62 to match his lowest PGA Tour round.

Merritt tied David Frost's tournament mark set in 1994 and topped the leaderboard at 12-under 130, a stroke off the 36-hole event record shared by Jack Nicklaus and Phil Mickelson.

Merritt, who opened with a 69 on Thursday, saw Spieth's score in the morning and knew the opportunity was there to go low.

"Anytime that you match shot for shot with the Masters champ, with the way he's playing, it's a pretty good feeling," said Merritt, whose career best in four seasons on the PGA Tour is a tie for second last year at the St. Jude Classic.

Spieth looked like the headliner Friday, following a 74 on Thursday with the 62 โ€” which tied his career low set at the Deutsche Bank Championship in 2013.

The 21-year-old Texan has been on a major role the past month, winning the Valspar Championship and finishing second in San Antonio and Houston before capturing his first major title at Augusta National last week.

Spieth birdied his final two holes at Harbour Town, electrifying the crowds already there to cheer him, to shoot the lowest tournament round in 10 years โ€” until Merritt did him one better.

Merritt had nine birdies over his final 10 holes to surge on top and send Spieth six shots behind on a day of low, low scoring. Merritt ended his round with four straight birdies, including a 5-footer on the signature lighthouse hole, No. 18, to tie the course record.

Merritt was four shots ahead of Matt Kuchar and John Merrick. Kuchar had a 66, and Merrick shot 65.

Past RBC Heritage winners and U.S. Open champions Graeme McDowell and Jim Furyk were 7 under along with Kevin Kisner. Furyk had a 64, Kisner shot 67, and McDowell 69.

Spieth was a stroke back at 6 under, tied for seventh in a pack that included former British Open winner Louis Oosthuizen, who shot a 67.

Harbour Town's rarely shown such little bite as low scores were everywhere. Brandt Snedeker, Bryce Molder and Russell Knox had 64s like Furyk. Kevin Streelman, Blake Adams, Brian Harman and John Peterson joined Merrick with 65s.

In all, 62 players, including 11 who didn't make the cut, shot sub-70 rounds. The second-round scoring average of 69.641 was the second-lowest ever in tournament history, only surpassed by the 2000 third round (69.162).

Spieth had the lowest round since Peter Lonard opened the 2005 event with a 62 on the way to capturing the title. It was a distinction that lasted just a few hours. Still, Spieth showed the energy and skill missing in Thursday's struggles.

"That's just better golf," Spieth said. "I told you guys yesterday, no excuses, I just played poorly."

Spieth said he corrected his ball position and cured the slice that kept him off target Thursday.

"I went back to posture, ball position, hand position and tempo," he explained. "And I struck that ball quite a bit better."

Most had understandably figured a highly fatigued Spieth wasn't long for the RBC Heritage. Along with a grueling week of grinding for a green jacket, Spieth spent two frenetic days in New York on an interview and appearance tour.

He arrived Tuesday night and took the course yesterday without playing a hole of practice. But Spieth said he was motivated to improve on his poor first-round showing.

"I don't want to go home early," he said.

He won't have to. But he's still got plenty of skilled players in front to become just the second player ever to follow a Masters victory with one at the RBC Heritage. Bernhard Langer accomplished that double in 1985.

LPGA

Sei Young Kim shot a 2-under 70 in wind gusting to 30 mph to take a one-stroke lead in the Lotte Championship at Kapolei, Hawaii.

With the breeze making birdies elusive at Ko Olina, the 22-year-old South Korean player reached 12-under 204 to break out of a first-place tie with I.K. Kim.

Sei Young Kim will take a lead into the final round for the second straight tournament. Two weeks ago, she had a four-shot advantage in the ANA Inspiration and finished fourth in the major championship.

Sei Young Kim won in the Bahamas in February in her second start as an LPGA Tour member.

I.K. Kim was second after a 71. Third-ranked Inbee Park was another shot back after a 69.

The top five are all from South Korea, with Jenny Shin four shots back after a 70, and Chella Choi at 7 under after 71. Defending champion Michelle Wie had five bogeys and four birdies in a 73 to fall eight shots back in her home event.

Champions

Ian Woosnam was tied for the lead at 4 under with five holes left when first-round play in the Champions Tour's Greater Gwinnett Championship at Duluth, Georgia, was suspended because of rain.

The round was scheduled to be completed Saturday morning at TPC Sugarloaf, followed by the second round. There is more rain in the forecast Saturday and Sunday.

Woosnam, playing in the event for the first time, was tied with Tommy Armour III, Joey Sindelar, Gary Hallberg and Olin Browne. Armour and Hallberg had four holes left, Sindelar three and Browne six.

Defending champion Miguel Angel Jimenez was even par through 11 holes. Bernhard Langer, second last year after winning the inaugural tournament in 2013, was 1 under through 12.

Only one group completed the first round, with Tom Byrum the clubhouse leader at 3-under 69.

Europe

American Peter Uihlein shot a 4-under 68 in windy conditions to take a one-stroke lead in the Shenzhen International at Shenzhen, China.

Uihlein had a 9-under 135 total at Genzon Golf Club. He won the 2013 Madeira Islands Open for his lone European Tour title.

Thailand's Kiradech Aphibarnrat was second after a 69. Two-time Masters champion Bubba Watson was tied for 42nd at even par after a 74.

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