( CNN ) -- Golf 's $ 10 million jackpot is well and truly up for grabs this weekend after the FedExCup series pacesetters faltered in Friday 's second round . Five players are guaranteed to take home the loot if they can claim the Tour Championship 's additional $ 1.44 million first prize on Sunday , but it was Adam Scott who moved into pole position at the halfway stage . The Australian started the week 19th in the PGA Tour 's standings , but a five-under-par 65 at East Lake gave him a one-shot tournament lead and catapulted him into top spot in the end-of-season playoffs . Webb Simpson , who leads the FedEx standings , was tied for 19th after his 70 -- which dropped him below Scott in the projected points . He bounced back from four early bogeys with a late birdie and an eagle . `` I 've got to win and I imagine Webb must have to finish pretty low to give me a chance , '' Scott , who birdied the last two holes for the second day in a row , told the PGA Tour website . `` I just figured if I win this week , I 'll be happy no matter what . I 'll finish what I think has been a really good season , moving in the right direction with everything , and look forward to next season . '' Veteran Korean K.J . Choi matched the resurgent Scott , who has bloomed since taking on Tiger Woods ' former caddy Steve Williams . Choi went into the weekend on seven-under 133 to be one shot clear of another in-form Australian , Jason Day , and world No . 1 Luke Donald . `` You never know what can happen in the next two days , '' said Choi , who regularly donates part of his winnings to charities . `` You know , if I were able to win that money ... I could put the money to good use through my foundation . But there 's still two days left , so all I can do is try to finish it out and hope for the best . '' Donald was the best of the top five as the Englishman carded 68 , one shot worse than Day . Big-hitting Bubba Watson burst into contention with a 64 to be tied for fifth with first-round leader Keegan Bradley , Bill Haas ( 67 ) and Hunter Mahan ( 68 ) . Bradley , who won his first major at nearby Atlanta Athletic Club six weeks ago , followed up his opening 64 with a 71 . Fellow American Jason Dufner , who he beat in a playoff at the PGA Championship , was another shot back on 136 after a 70 . No . 2 Dustin Johnson suffered two double bogeys in his 73 to fall to a tie for 26th in the 30-man field to a projected fourth overall . England 's No . 3 Justin Rose was in a group of three at the bottom of the heap after a 75 dented his hopes .
Adam Scott leads at the halfway stage of the Tour Championship in Atlanta . Australian shoots five-under 65 to move one clear of Korea 's K.J . Choi . He also takes top spot in FedEx Cup points projections from Webb Simpson . Simpson one of five players who will claim $ 10 million with victory on Sunday .