Keegan Bradley fired a six-under 64 Thursday to grab a two-stroke lead after the opening round of the Tour Championship.
Bradley, a tour rookie, has won two events this year, including the PGA Championship.
World No. 1 Luke Donald parred the 18th hole after a brief weather delay to post four-under 66. He was joined in second place at East Lake Golf Club by Jason Dufner and Chez Reavie.
Rain started to fall after the final groups made the turn. With two groups remaining, officials blew the horns to take players off the course due to threatening weather in the area. After a 29-minute delay, the final two groups returned to the course to complete their rounds.
Charles Howell III, Matt Kuchar, Adam Scott, Hunter Mahan and Jason Day share fifth place at minus-three.
