Englishman Paul Casey eagled the 18th hole at TPC Boston on Sunday to take a three-stroke through three rounds of the Deutsche Bank Championship in Norton, Mass.
Casey, 39, shot a five-under par 66 in pursuit of his second PGA Tour victory. He nearly made an albatross at the par-5 18th, his ball just skirting the hole and stopping a foot away. Casey, at 15-under par 198, is three ahead of Brian Harman, who posted a 68.
In seven of Casey's 13 career stroke-play victories, he has held at least a share of the lead going into the final round.
Jimmy Walker, PGA Championship winner, is tied for third with Smylie Kaufman and Kevin Chappell, four back of Casey. Ryan Moore, meanwhile, is alone in sixth place at 10 under.
Rory McIlroy had one of the better rounds of the day, shooting a five-under 66. He narrowly missed an albatross on the 18th hole, but six birdies and an eagle. He is tied for seventh with Justin Rose, Tony Finau and Louis Oosthuizen at nine under.
Patrick Reed, the FedEx Cup points leader, is tied for 11th with Steve Stricker at eight under.
Jordan Spieth struggled with three bogeys to open his round and finished at one-over 72. He is tied with Sergio Garcia, Adam Scott and Olympic silver medalist Henrik Stenson for 23rd at five under.
World No. 1 Jason Day shot a three-under 68, moving to four under. He is tied for 33rd with Dustin Johnson and Rickie Fowler.
Johnson struggled after entering the round just three strokes back of the lead. He shot a four-over 75, falling back to four under for the tournament.