Viktor Hovland leads on 15-under, one shot ahead of Ryan Gerard, with McIlroy tied for seventh.
Rory McIlroy is five shots off the lead heading into the final round of the Tour Championship after firing a seven-under-par 63 in Atlanta.
The Northern Irishman moved to 10-under overall with nine birdies during an impressive third round.
Viktor Hovland leads on 15-under, one shot ahead of Ryan Gerard, with McIlroy tied for seventh.
McIlroy is due to tee off for the final round at 6:14pm IST with his playing partner Cameron Young.

Wales Stun All Blacks To End 73-Year Wait For Victory
Ireland Face Must-Win Kosovo Clash After Narrow Defeat To Austria
Kildare Trio Feature As Ireland Overcome Fiji In Nations Championship
Kildare's Sean O'Haire Kicks Dramatic Last-Minute Winner In American College Football
Sunday Morning Sports Update
Milltown Through To Leinster Intermediate Semi-Finals After Victory Over Meath Champions
Sarsfields Leinster Championship Campaign Ends After Heavy Defeat To Cuala
More Than 20 Horses Withdrawn At Cheltenham Over Ground Conditions