World number one Tiger Woods, seeking his eighth career victory at the World Golf Championships Bridgestone Invitational, fired a two-under par 68 on Saturday to keep a seven-stroke lead after 54 holes.
One day after matching the low round of his career and the Firestone Country Club course record with a 61, Woods maintained the same gap he had opened on the field on Friday, with a three-round total of 15-under par 195.
Woods, a 14-time major champion chasing the all-time record of 18 majors won by Jack Nicklaus, is in a commanding position to claim his fifth victory of the season and has sent a message that he is in top form entering next week's PGA Championship, the final major event of the year.
Sweden's Henrik Stenson fired a 67 to stand second on 202, one stroke in front of American Jason Dufner, who also shot 67 on Saturday.
England's Luke Donald and Chris Wood and American Bill Haas shared fourth on 204 with American Keegan Bradley and Spain's Miguel Angel Jimenez on 205.
Woods opened with back-to-back birdies, then closed the front nine with a bogey only to answer with a birdie at the 10th. Woods birdied the 13th but took a bogey at the next hole and continued the up and down run with a bogey at the par-5 16th followed by a birdie at the par-4 17th.