Paul Casey has established a three-shot lead at the Deutsche Bank Championship after he registered a third successive score of 66.
The Englishman trailed Kevin Chappell by one shot heading into Sunday's play but as Chappell settled for an even-par round, Casey produced another stellar display that concluded with a birdie and an eagle from his final three holes.
The nearest challenger to Casey is American Brian Harman after he moved up two places to second by shooting a 68, while Jimmy Walker and Smylie Kaufman join Chappell in a tie for third spot.
The biggest mover of the day was Louis Oosthuizen, who improved by 47 places to move into a share of seventh with Rory McIlroy, who also enjoyed an excellent Sunday with a round of 66.
Olympic champion Justin Rose also features alongside Oosthuizen and McIlroy after he continued to perform consistently in what is the second tournament of the Fedex Cup playoffs.
