After consecutive rounds of 66 at East Lake, Billy Horschel is halfway to a $10 million payday. Here's how things look after the second round of the Tour Championship, where Horschel leads by two shots:
What it means: Horschel began the day with a share of the lead alongside Kirk but built a cushion heading into the weekend with three back-nine birdies. He's successfully carried the momentum from his BMW Championship win to Atlanta, but two of the other players who control their own FedEx Cup destiny - McIlroy and Kirk - remain hot on Horschel's heels.
Round of the day: McIlroy got off to a quick start, with three birdies across his first seven holes, and after a string of pars in the middle of his round, he closed with birdies on Nos. 17 and 18 to post a 5-under 65. The Ulsterman began the day three shots back, but after six birdies against just one bogey, he's now very much in contention as he eyes his first FedEx Cup title.
Best of the rest: Horschel played his first 22 holes without a bogey this week, but even after dropped shots on Nos. 5 and 7, he bounced back quickly. Horschel birdied the par-5 ninth, then added circles on Nos. 11, 14 and 17 to put himself in position for a second consecutive win.
Biggest disappointment: Patrick Reed began the day just one shot back, but after ballooning to a 4-over 74, Reed is now nine shots back and trailing half the field. Reed had double bogeys on both the fourth and sixth holes, closing with back-to-back bogeys to card a high round for the third straight week, following an 82 at TPC Boston and a 77 at Cherry Hills.
Main storyline heading into Saturday: Horschel and McIlroy were both in the mix two weeks ago at the Deutsche Bank Championship, and they'll be the pair to watch during the third round at East Lake. Both men know that a win this week will yield the FedEx Cup and a $10 million prize. While Horschel begins with an advantage, McIlroy - who has hardly cooled since three straight wins earlier this season - might be the man to beat.
Shot of the day: Like McIlroy, Na finished with birdies on Nos. 17 and 18, though his closing birdie was done in style. After flying the green on the par 3, Na holed his downhill chip from 35 feet to cap a 4-under 66 and thrill the fans gathered around the final green.