ST. ANDREWS, Scotland (AP) — Jordan Spieth was one shot out of the lead and one round away from the third leg of the Grand Slam. Not since Bobby Jones has an amateur won the British Open, and then along came Paul Dunne with a bogey-free performance Sunday at St. Andrews that gave him a share of the lead.

When a shootout at St. Andrews ended Sunday, 14 players were separated by three shots. Half of them were major champions.

Even for a place packed with centuries of history, this British Open offered endless possibilities.

Dunne, the 22-year-old from Ireland, was impervious to everything around him and soaked up a day he won't soon forget in his round of 6-under 66. Louis Oosthuizen, the last player to lift the claret jug on the Old Course in 2010, made three birdies over his last five holes for a 67. Jason Day had a share of the 54-hole lead for the second straight major with a 67, and this time he doesn't have to worry about vertigo symptoms he dealt with at the U.S. Open.

They were at 12-under 204.

Spieth ran off three straight birdies on the back nine and kept alive his hopes of becoming the first player to sweep the four professional majors in one year. He finished with a 66. Ben Hogan in 1953 was the only other player to win the Masters, U.S. Open and British Open in the same year.

Second-round leader Dustin Johnson had a 75 to fall five shots behind.

Jones was the last amateur to win the British Open in 1930 when he came from one shot behind in the final round. He was the last amateur to lead after 54 holes three years earlier at St. Andrews, and he won the claret jug that year, too.

BARBASOL CHAMPIONSHIP

OPELIKA, Ala. (AP) — Scott Piercy won the Barbasol Championship on Sunday for his third PGA Tour, closing with a 6-under 65 for a three-stroke victory.

The 36-year-old Las Vegas player made a 57-foot birdie putt on the second hole en route to his first victory since the 2012 Canadian Open. Tied for the third-round lead with Ricky Barnes, Piercy birdied three of four holes starting on No. 13 and finished at 19 under on Grand National's Lake Course.

Piercy began the season on a major medical extension after surgery on his right arm last year.

Birmingham native Will Wilcox was second after a 67.

Barnes, University of Alabama junior Robby Shelton and South Korea's Whee Kim tied for third at 14 under. Shelton shot 67, Kim 69, and Barnes 70.

MARATHON CLASSIC

SYLVANIA, Ohio (AP) — Chella Choi won the Marathon Classic for her first LPGA Tour title, beating fellow South Korean player Ha Na Jang with a birdie on the first hole of a playoff.

The 24-year-old Choi won in her 157th start on the tour.

With father Ji Leon Choi serving as her caddie, Choi closed with a 5-under 66 to match Jang at 14-under 270 at Highland Meadows. Jang, the leader after each of the first three rounds, shot a 68.

In the playoff on the par-5 18th, Choi chipped onto the green from 87 yards and two-putted from 25 yards for the par — holing a 1-footer. Jang bogeyed the hole after hitting approach long into high rough.

Second-ranked Lydia Ko, the winner last year, had a 67 to tie for second with Shanshan Feng at 13 under. Fend also shot 67.

STONEBRAE CLASSIC

HAYWARD, Calif. (AP) — South Korea's Si Woo Kim won the Stonebrae Classic for his first Web.com Tour title, birdieing the first hole of a playoff with Jamie Lovemark and Wes Roach.

The 20-year-old Kim shot a 2-under 68 to match Lovemark and Roach at 12-under 268 at TPC Stonebrae. The three players began the round tied for the lead.

Lovemark, playing a group ahead of Kim and Roach, bogeyed the par-5 18th in regulation to fall into a tie. Kim and Roach followed with pars, sending the trio back to the 18th tee for the playoff.

Kim earned $108,000 to jump from 67th to 16th on the money list with $162,350.

DANIELLE DOWNEY CLASSIC

ROCHESTER, N.Y. (AP) — Anne Park won the inaugural Toyota Danielle Downey Classic for her first Symetra Tour title, beating former Solheim Cup player Vicky Hurst by a stroke.

Making her fourth professional start, the 20-year-old former Southern California player closed with a 4-under 68 at Brook-Lea Country Club.

Park, from from Levittown, New York, finished at 16-under 272. She earned $22,500 to jump from 93rd to 17th on the money list with $26,206. The final top 10 will earn 2016 LPGA Tour cards.

Hurst eagled the 10th in her bogey-free 66. She played for the United States in the 2011 Solheim Cup.

AMERICAN CENTURY CHAMPIONSHIP

STATELINE, Nev. (AP) — Mark Mulder won the American Century Championship, holding off fellow former major league pitcher Eric Gagne by a point in the celebrity event.

Mulder finished with 82 points at Edgewood Tahoe in the modified Stableford event. Players receive six points for eagle, three for birdie, one for par, none for bogey and minus-2 for double bogey or worse.

Mulder had seven birdies and two bogeys for a 67 and a 30-point round. He earned $125,000.

Gagne also had a 30-point day, making an eagle on the par-4 10th in a 67.