Frustrated Kaymer ends opening round on a sour note

Aug 13, 2015; Sheboygan, WI, USA; Matt Kuchar hits his tee shot on the 10th hole during the first round of the 2015 PGA Championship golf tournament at Whistling Straits. Brian Spurlock-USA TODAY Sports

KOHLER, Wisconsin (Reuters) - A double-bogey on his final hole left Martin Kaymer with a bitter taste in his mouth after he had played good, grinding golf for most of his opening round at the PGA Championship on Thursday.

The German, who won the PGA Championship when it was last played at Whistling Straits five years ago, had battled hard to record five birdies and a bogey on the challenging links-style layout where the wind picked up over the closing stretch.