Jordan Spieth stormed into contention for an historic third major title in 2015 after a dramatic third round of the US PGA Championship at Whistling Straits.
Spieth was five shots behind with just two holes to play as Jason Day threatened to take control with six threes in succession from the ninth, including four birdies and an eagle.
However, the gap was suddenly reduced to two when Spieth birdied the 17th as Day was taking two shots to get out of bunker to double bogey the 15th, and it was down to one when Spieth carded his sixth birdie in eight holes to complete a stunning back nine of 30 and a flawless 65.
Day responded superbly with a birdie from 25 feet on the 17th to shoot 66 and finish 15 under par, two shots clear of Spieth with England's Justin Rose and South African Branden Grace one shot further back.
Masters and US Open champion Spieth is now 50 under par for this year's majors as he looks to become only the second player after Ben Hogan and Tiger Woods to win three majors in a season - Woods was 53 under in winning the US Open, Open and US PGA in 2000.
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