McIlroy won the Tour Championship on Sunday, . clinching the FedEx Cup and its $15 million cash prize. . The $15 million was the largest payout in golf history. . McIlroy shot a 4-under 66 final round to finish 4 shots ahead of Xander Schauffele. . The win vaults McIlroy to No. 2 in the world behind Brooks Koepka. . McIlroy was paired with Koepka in Sunday's final group, . and he took the lead with a three-shot swing on hole No. 7. . McIlroy joined Tiger Woods as the only two-time winners of the FedEx Cup since it started in 2007. . Thank you to all the fans from around the world for your incredible support throughout the season. It truly means so much to me. Now it’s time to celebrate! , Rory McIlroy, via Twitter.