Rory McIlroy began the Bridgestone Invitational with a 69, to end the day five shots off the lead on one under par.
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Graeme McDowell shot a 71, and he'll begin day two from one over.
Leading the way in Ohio is Marc Leishman – the Aussie is six under par following a 64, he's one clear of a group of three.
American Dustin Johnson has ruled himself out of this year's Ryder Cup.
He says he is taking a break from golf in order to seek "professional help for personal challenges".
Johnson was the only unbeaten United States player when Europe lifted the famous trophy two years ago.
