Danny Lee capitalised on a error from Justin Thomas to grab a share of the lead heading .
A three-shot swing at the par-five 18th watched Lee pit a eagle and Thomas make bogey after knocking his strategy.
While Lee transferred into a share of the benefit with a four-under 68 thomas, chasing another win in three years in the case, mixed six birdies with four bogeys during his third-round 70.
Cameron Smith leads the chasing pack and is just three strokes off the pace in third, with Jordan Spieth and Wyndham Clark that a further shot back into tied-fourth before Byeong Hun An.
Beginning the day with a lead, Thomas bounced back by a bogey in the par-three second to hole a 20-footer in the knee in the following and then birdie the ninth to make it to the turn in 35.
After finding trees byeong Hun An moved alongside Thomas following a a front-nine 34 at the 10th, simply to triple-bogey another.
Lee obtained within one of their guide until falling three shots at the first two holes nine, as Thomas posted birdies either side of a blemish.
Thomas rolled to keep his edge within Lee, who birdied the 12th and 15th, only to come across the water with his second shot to the par-five last.
The 2017 champion got up and down to avoid falling more than one shot and discovered the rough at the back of the green, as Lee emptied a 60-footer from over a ridge to generate an eagle.
English set Ian Poulter and Tyrrell Hatton are at the group off off the pace in tied-seventh that also includes US Open winner Gary Woodland and Graeme McDowell, while world no 1 Brooks Koepka withdrew ahead of the round after aggravating a knee injury.
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