Dustin Johnson moved a big step closer to victory of the FedExCup by opening a five-stroke lead heading into the Tour Championship final round.

The 22-time winner on the PGATOUR, seeking for the first time to claim the FedExCup and its $15 m jackpot, birded the last to post a six-under 64 and equalled the lowest round of the week at East Lake.

Johnson heads to the final round on Monday, 19-under and five ahead of the closest challengers Justin Thomas and Xander Schauffele, with last week’s BMW Championship winner Jon Rahm taking another shot back in fourth place.

Starting the day one ahead, Johnson opened with two-putt pars on the first two holes before rolling in a five-footer at the third, which was enough to move three ahead when playing partner Sungjae Im made bogey at the same hole.

Thomas holed a 30-footer to save par at the fifth and drained a 20-foot eagle at the par-five next, with the 2017 FedExCup champion adding a 10-foot birdie at the seventh to briefly get within one.

Johnson failed to take advantage of the par-five sixth but responded by firing his approach at the seventh to tap-in range, with a seven-foot birdie at the ninth seeing him reach the turn four ahead.

Thomas took two attempts to get out of the rough to bogey the ninth and then three-putted the 10th from 11 feet to fall five behind, as Johnson cancelled out a 20-foot birdie at the 10th by missing a six-footer to save par at the next.

Johnson converted a 25-foot putt from the fringe at the 11th to go four ahead, with Schauffele – who birdied the 10th and 12th – joined on 13 under by Thomas after he posted long-range birdies at the 11th and 14th.

The world No 1 added another birdie at the 14th and scrambled from the sand to save par at the next, before a super pitch from just short of the final green set up a nine-foot birdie to extend his lead to five strokes.

Schauffele holed a 10-footer at the last and Thomas finished with a two-putt gain to both move to 14 under, with Rahm closing his third-round 66 with back-to-back birdies to get within six of the lead.

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