Sweden's Robert Karlsson maintained a one-stroke lead over American Harrison Frazar after Saturday's third round of the St Jude Classic in Memphis.
Karlsson settled for a two-under par 68 to complete 54 holes on 11-under, one shot ahead of Frazar, who birdied three of the last four holes.
England's Lee Westwood is nine shots off the lead after a third round of 69.
"I played a solid round of golf so I'm pretty happy. I'm looking forward to it on Sunday," said Karlsson.
"It's important not to get ahead of yourself, to keep playing. It's a new round tomorrow and I will keep going with it."
Frazar and two-time US Open champion Retief Goosen each fired 64s to charge up the leaderboard ahead of the final tournament round before next week's US Open at Congressional Country Club in Bethesda, Maryland.