SOUTHAMPTON, Bermuda: Reigning US Open champion Martin Kaymer of Germany birdied the first playoff hole Wednesday to defeat reigning Masters champion Bubba Watson and win the 32nd PGA Grand Slam of Golf.

Kaymer, who collected his second career major title last June at Pinehurst, and Watson, the big-hitting US star who won his second green jacket last April, each finished the 36-hole showdown of major winners on six-under par 136 at Bermuda's Port Royal layout.