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World number one Dustin Johnson built a healthy five-shot lead heading into the final round of the PGA Tour's season-ending Tour Championship.
The American was a shot clear of Sungjae overnignt but fired a six-under 64 during the third round, including seven birdies.
Xander Schauffele, after a round of 67, is tied for second place with Justin Thomas, who claimed a four-under 66.
Spain's Jon Rahm also shot a 66 at the East Lake Golf Club in Atlanta.
Northern Ireland's Rory McIlroy went round in level par to stay on eight under, 11 shots off the lead, where he was joined by England's Tyrell Hatton after a one-over 71.
Like the leader, Daniel Berger shot a 64 to climb into the top 10, two shots behind US PGA winner Collin Morikawa who is in fifth place after his 67.
Meanwhile American John Catlin won his first European Tour event in the Andalucia Masters as Martin Kaymer missed the chance to end his six-year title drought.
Kaymer missed close-range birdie chances on the 16th and 17th at Valderrama and then bogeyed the 18th.
His playing partner Catlin did not make a single birdie in the final round but secured a one-shot victory on Sunday.