Sweden's Robert Karlsson won the Dubai World Championship Sunday, defeating third-round leader Ian Poulter in a two-way playoff after a bizarre marking blunder by the Englishman on the final hole. Karlsson calmly rolled in a birdie putt on the second playoff hole after Poulter was given a one-stroke penalty for dropping his ball on his marker on the green, causing it to flip over and move from its original position.\\ "The coin was one way and the next minutes facing the other way," Poulter said. "It's pitched right on the front and flipped over. If it pitches in the middle, the coin doesn't move and it's fine." Poulter spotted his error and reported it to the match referee, whose ruling left him with a long putt for par instead of a birdie. The putt came up a foot short, taking all the pressure off Karlsson. He then had two shots to clinch the victory in the season-ending $7.5 million tournament. Read more: http://sports.espn.go.com/golf/news/story?id=5859509
