(CNN)  -- Germany's Martin Kaymer beat Bubba Watson after a three-hole playoff to win the 92nd PGA Championship at Whistling Straits and claim his first major title. Dustin Johnson should have joined Kaymer and fellow American Watson in the playoff but was controversially penalized two-shots for an infringement on the final hole in regulation play. Johnson initially finished on 11-under 277 but was ruled to have grounded his club in a bunker before playing his second shot to the 18th green and his five became a triple bogey seven, putting him back to nine-under. Watson initially made the running in the playoff as he made a birdie at the first extra hole, but Kaymer hit back with a birdie of his own on the next.
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Germany's Martin Kaymer claims 92nd PGA Championship at Whistling Straits
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Kaymer beats American Bubba Watson in three-hole playoff in final major of season
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Dustin Johnson penalized two shots on final hole to miss out on playoff
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Phil Mickelson finishes tied 12th so Tiger Woods still world number one
The 18th proved the decider and @placeholder found the water with his approach to the green and could only make a double bogey.
It means @placeholder remains as world number one, but he finished well off the pace after a fine round one-over 73, still searching for the first win of his truncated season.