Scottie Scheffler ended the first day of the Tour Championship at East Lake Golf Club with a five-stroke lead at 15 under thanks to the combination of a fine display and his FedEx Cup points advantage.

Scheffler, who enjoyed a meteoric rise this PGA Tour season to earn the ranking of world number one, began the tournament at 10 under par thanks to his position atop the FedEx Cup standings coming into Thursday's first round.

And he bolstered his hopes of claiming FedEx Cup success with a five-under 65 that ensured he heads into Friday with gaping five-stroke lead.

In second is Xander Schauffele at 10 under after his four-under round, while Matt Fitzpatrick is third after being one of two players to shoot the round of the day (64).

The other 64 came from Chile's Joaquin Neimann, who has pulled himself into contention in a tie for fourth, where he is joined at eight under by Patrick Cantlay.

Cantlay started the day at eight under and needed an eagle on the last hole just to post an even-par round after winning last week's BMW Championship.

A further shot back at seven under is Im Sung-jae, Cameron Smith and Rory McIlroy, all of whom started at four under and shot 67s.

It was by no means a consistent round from McIlroy, however. He was four over par for the round after the fourth hole and he tallied only four pars in what was an erratic showing.

Justin Thomas, Jon Rahm, Sepp Straka, Sam Burns and Cameron Young are the last players to sneak into the top-10, tied for ninth at six under, while Collin Morikawa headlines the small group at five under.

Corey Conners was Thursday's worst performer, finishing his day at three over after shooting 74 to sit in 29th, with the 30th entrant, Will Zalatoris, having withdrawn earlier in the week after suffering a back injury at the BMW Championship.