ATLANTA, Georgia (REUTERS) - England's Paul Casey held a one-stroke lead over Americans Kevin Kisner and Brooks Koepka midway through the third round of the Tour Championship at East Lake in Atlanta on Saturday (Sept 23).

Casey, in the chase for the FedExCup and its US$10 million (S$13 million) bonus, started impressively with three birdies and an eagle in his first seven holes before consecutive bogeys left him at 10-under.

The eagle came at the par-5 sixth hole where Casey sank a 11-foot putt.

Kisner and Koepka were 9-under through 13 holes with Australian Jason Day among those still on the course at 8-under Webb Simpson, joint overnight leader with Casey and Justin Thomas, stood at 7-under through 10 holes while Thomas was at 6-under through nine after three bogeys.

Sunday's winner of the season-long FedExCup standings, which will be determined by the outcome of the Tour Championship, will receive a $10 million bonus.

Americans Jordan Spieth and Thomas were 1-2 in the standings through Friday's play.