The 2010 PGA Championship was the tournament's 92nd edition, and was marked by a controversial penalty and a playoff for the trophy.
Winner: Martin Kaymer, 277
Where it was played: Whistling Straits, Kohler, Wisconsin
Tournament dates: August 12-15, 2010
Leader after first round: Matt Kuchar, 67
Leader after second round: Matt Kuchar, 136
Leader after third round: Nick Watney, 203
Notable Notes: Martin Kaymer beat Bubba Watson in a 3-hole, aggregate-score playoff, but it's the guy who was missing from the playoff for whom this major is often remembered.
Watson posted 11-under first, then Kaymer tied him with a 15-foot par save on the last hole. Meanwhile, Johnson birdied the 16th and 17th holes to lead by one going to the last. He bogied, apparently falling into a tie, but upon leaving the hole was informed by rules officials of a penalty he incurred while played the 18th hole.
Johnson hit his drive into a sandy area and did not recognize that he was in a bunker. So when he grounded his club in that bunker, it was a 2-stroke penalty. Many believed the design of Whistling Straits, with tiny pockets of sand everywhere, was unfair to Johnson in this instance. But players had been clearly informed before the tournament started that sandy areas would be treated as bunkers.
Kaymer won the 3-hole playoff over Watson by one stroke.