Danny Lee capitalised from Justin Thomas on a error to Catch a share of the lead heading .
A three-shot swing in the 18th watched Thomas make bogey after knocking his approach into the danger and Lee pit a eagle, making the group.
While Lee transferred with a 68, thomas, pursuing a second win mixed six birdies with four bogeys through his third-round 70.
Cameron Smith is just three strokes off the pace in third, together with Jordan Spieth and Wyndham Clark that a further shot back in tied-fourth ahead and directs the chasing bunch.
Starting the afternoon with a two-shot direct, Thomas bounced back from a bogey at the par-three second to hole a 20-footer in the knee in the second and then birdie the ninth to reach the turn in 35.
After locating trees off the 32, byeong Hun An moved alongside Thomas following a subsequent a front-nine 34 at the 10th, only to triple-bogey the next.
Lee obtained within one of the lead until dropping three shots in the first two holes nine, as Thomas submitted birdies both sides of a blemish in the 13th to move three clear.
Thomas rolled to keep his edge over Lee, who birdied the 12th and 15th to discover the water with his next shot into the par-five last.
The 2017 champion got up and down to refrain from falling more than one shot and found that the rough, as Lee drained a 60-footer from within a ridge to create an eagle.
Tyrrell Hatton and english set Ian Poulter are in the team off off the pace at tied-seventh that contains US Open winner Gary Woodland along with Graeme McDowell, whilst world no 1 Brooks Koepka withdrew ahead of his round.
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