Sweden’s Stenson leads long-time leader Mickelson by one stroke at 12-under with a five-shot cushion back to nearest chaser Bill Haas of America going into the final day.
Stenson, 40, an accomplished Tour winner, former world No. 2 and three-time Ryder Cup star, is bidding to become the first Scandinavian man to win a major title.
Mickelson, 46, is chasing a sixth major title and first win since clinching the Open at Muirfeld in 2013.
The tussle at Troon on a blustery, mizzly Saturday was reminiscent of the famous “Duel in the Sun” Open featuring Jack Nicklaus and Tom Watson down the road at Turnberry in 1977. Except in much worse weather.
Mickelson led by one starting out but Stenson…