A cautious Tiger Woods remained on course for an eighth WGC-Bridgestone Invitational title.
Woods began the final round seven shots clear of the field at Firestone Country Club having followed his stunning 61 on Friday with a 68 yesterday.
And the World Number One looked content to simply cruise towards the winning line as he carded nine straight pars to remain 15 under par in Akron.
Defending champion Keegan Bradley was in second spot on eight under after four birdies and one bogey in an outward nine of 32, with Sweden's Henrik Stenson, England's Luke Donald, Spain's Miguel Angel Jiménez and American Jason Dufner all a shot further back.
Playing alongside Woods, Open runner-up Stenson had carded eight pars and a bogey on the third, while Donald had birdied the second and third but dropped a shot on the ninth.
Jiménez, the oldest winner in European Tour history when he won the Hong Kong Open in November last year aged 48, had also covered the front nine in 34 before picking up another shot on the tenth.
World Number Three Rory McIlroy, seeking to rediscover top form ahead of the defence of his US PGA Championship title next week, carded a closing 72 to finish two over.
Woods finally registered his first birdie of the day on the tenth, holing from seven feet, and with Bradley dropping a shot on the 12th after a wayward tee shot, the lead was up to nine shots.
He still had some way to go to match his record margin of victory however, having won the 2000 US Open at Pebble Beach by 15 shots, and when Dufner birdied the 13th the gap was back to eight strokes.
Woods three-putted the 14th for a bogey, but the only real matter of interest by now was the battle for second place.
Bradley gained the upper hand with a birdie from 20 feet on the 17th to reach eight under par, one shot ahead of Dufner and Stenson with former Masters Tournament champion Zach Johnson safely in the clubhouse on six under after a closing 67.
Ryder Cup hero Martin Kaymer had gone one better with a 66, the former World Number One recovering from an opening 74 with three rounds in the 60s to finish four under.