Jordan Spieth's lead at The Masters was cut to a single shot after the defending champion suffered a late wobble at the end of the third round.
The 22-year-old was in the final group with Rory McIlroy and outplayed the Northern Irishman for much of the round to extend his lead to four shots over the field.
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However, a bogey-double bogey finish saw Spieth drop to three-under-par for the tournament, just one ahead of fellow American Smylie Kaufman.
McIlroy's record when playing with Spieth was good going into the round, but he dropped five shots behind the leader (+2) with a five-over 77 that did not include a single birdie, the first time in 81 Major rounds he has failed to make one.
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Spieth is one of just four players under-par at Augusta this week. Kaufman is on his own at two-under, with Hideki Matsuyama and 58-year-old two-time champion Bernhard Langer one-under.
World number one Jason Day, Dustin Johnson and Danny Willett are tied for fifth at level-par, while England's Lee Westwood is a further shot back at one-over.
