Jason Kokrak upstaged Jordan Spieth, outlasting the former world number one to lift the Charles Schwab Challenge trophy.

Spieth carried a one-stroke lead into the final round at Colonial Country Club, where the three-time major champion was looking to add to his 2016 triumph.

But Kokrak had other ideas and shot a 70 to prevail by two shots as Spieth faltered via a three-over-par 73 in Fort Worth, Texas on Sunday.

Kokrak mixed two birdies with three bogeys over the first seven holes, though a run of three birdies over a six-hole stretch from the eighth to the 13th fuelled the American.

The victory made Kokrak the first player over the age of 35 to win his first two PGA Tour titles in the same season since Italian Francesco Molinari achieved that feat – which included an Open Championship triumph – in 2018.

Spieth made a slow start behind three consecutive bogeys from the second to fourth holes before responding with birdies at the sixth and ninth, but he found water at the 18th, having bogeyed the 15th.

Kokrak – who finished 14 under – earned a second victory from his last 17 starts following the 36-year-old's success at the CJ Cup earlier this PGA Tour season.

Charley Hoffman (65), Patton Kizzire (67), Sebastian Munoz (68) and Ian Poulter (68) ended the tournament four shots off the pace in a tie for third.

Defending champion Collin Morikawa's bid for back-to-back titles resulted in a share of 14th position at five under after he posted a final-round 68.

Former world number one and 2013 U.S. Open champion Justin Rose (71) and Sergio Garcia (76) – the 2017 Masters champion and 2001 winner of this event – finished in a tie for 20th, 10 strokes behind Kokrak.

Jordan Spieth birdied his last hole to retain a one-stroke lead heading into the final round at the Charles Schwab Challenge.

Jason Kokrak had joined 2016 champion Spieth atop the leaderboard before the latter stepped up to birdie the 18th in the third round at Colonial Country Club on Saturday.

Former world number one Spieth signed for another four-under-par 66 to remain the player to beat ahead of Sunday's finale in Fort Worth, Texas.

Spieth, whose 40-hole bogey-free streak ended at the par-four fifth hole, is eyeing his second PGA Tour title of the season, having ended his four-year trophy drought via last month's Texas Open.

A three-time major champion, Spieth only dropped two shots as he finished with six birdies, including three across a flawless back nine to be 15 under through 54 holes.

Fellow American Kokrak stayed within a shot of Spieth courtesy of his third-round 66.

Sergio Garcia – the 2017 Masters champion and 2001 Charles Schwab Challenge winner – is five strokes off the pace following his two-under-par 68.

Ian Poulter (64) surged up the leaderboard, improving 26 positions to be tied for fourth at eight under alongside Sebastian Munoz (70).

Former world number one and 2013 U.S. Open champion Justin Rose (69) is 10 shots behind Spieth, defending champion Collin Morikawa is two strokes further back after his 72, while Justin Thomas (71) slipped to 46th – 14 shots adrift.

Jordan Spieth seized control of the Charles Schwab Challenge after claiming a one-shot lead at the half-way stage of the tournament, while Phil Mickelson failed to qualify for the weekend.

Former world number one and three-time major champion Spieth earned the outright lead thanks to a four-under-par 66 in Fort Worth, Texas on Friday.

Spieth entered the second round tied with 2017 Masters winners Sergio Garcia atop the standings by two strokes at Colonial Country Club.

Winner of the 2016 Charles Schwab Challenge, Spieth followed up his flawless 63 with another bogey-free round to move clear of the field after play was temporarily suspended due to inclement weather.

Spieth – who is the only bogey-free player through 36 holes at 11 under – holds his 13th second-round lead/co-lead on the PGA Tour – he is six-for-12 to date converting to victory.

Fellow American Jason Kokrak is second following his five-under-par 65, while Garcia (69), Sebastian Munoz (65) and Patton Kizzire (65) are two shots further back at eight under.

Defending champion Collin Morikawa is six shots off the pace after posting a second-round 66.

Justin Thomas (66) registered his 51st bogey-free round of his career. The 14-time PGA Tour champion, who is two under, recorded his 102nd round of 66 or better since 2012 – marking the fourth best on Tour.

Meanwhile, US PGA Championship winner Mickelson missed the cut, despite a heroic 69.

Mickelson, who made history at last week's PGA Championship after the 50-year-old became the oldest major winner in golf history, ended the event two over – just a shot outside the cut line.

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