TROON, Scotland — Henrik Stenson is the champion golfer of the year, thanks to a final round for the ages. He kept hitting the best shots of his life, one after another, and he needed each one to stay ahead of Phil Mickelson in a British Open duel that ranked among the best in major championship history. Stenson made 10 birdies, including a 50-foot putt across the 15th green that had him pumping his fist in a rare show of emotion Sunday.