Dustin Johnson followed up an excellent 63 with yet another very good five-under 65 on Saturday to remain in the lead going into the final round at the St Jude Classic.
The world number two posted one of the best rounds on the course and finds himself in a tie with 29-year-old Andrew Putnam, who shot a six-under 64 to move into 15 under.
Stewart Cink is all alone in third place at 10 under after a six-under 64.
The 2009 Open Champion's round was aided by a hole-in-one on the eighth.
"It can be a little bit of a shock when it happens and you know suddenly you find yourself right there in the mix and you've got to reset yourself," Cink told CBS after his round.
"But I did a really good job the rest of the day and I'm looking forward to tomorrow."
Richy Werenski (66) and Wesley Bryan (69) find themselves in contention after good days. They are tied for fourth at nine under.
Phil Mickelson is tied for 49th at one under.
