A 5-under third round 66 vaulted Justin Thomas to the top of the leaderboard on Saturday. JT made five birdies on the day, as well as an ace on the 13th hole, getting him to -12. In second, also with a 5-under round on Saturday, is world #1 Dustin Johnson. Johnson is one stroke back at -11. 36 hole leader Rory McIlroy is tied with Phil Mickelson in third place, at -10. Jordan Spieth had the low round of the day, with an 8-under 63. Spieth is tied for 10th place at -7.