Martin Kaymer golfer in the world, making him only the second German (after Bernhard Langer) to be the top-ranked golfer in the world. At the time he was the second youngest to reach world number one behind Tiger Woods, soon surpassed by Rory McIlroy in March 2012, who gained the top ranking at age 22. In April, he relinquished his number one ranking after eight weeks to Westwood, who won the Indonesian Masters. After reaching the number one ranking, Kaymer decided to undergo a swing change to be able to move the ball both ways. Frustrated with his disappointing results at the
2013 U.S. Open (golf) (12,13,14), Martin Kaymer (13,14), Y. E. Yang K. J. Choi, Matt Kuchar (12,13,14) Matteo Manassero (13,14) Kevin Chappell, Jason Dufner (12,13,14), John Peterson, John Senden (12), Michael Thompson (13,14), David Toms, Lee Westwood (12,13,14), Casey Wittenberg Luke Donald (13,14), Rickie Fowler (13,14), Sergio García (13,14), Robert Garrigus (13,14), John Huh, Dustin Johnson (13,14), Zach Johnson (13,14), Hunter Mahan (13,14), Ryan Moore (13,14), Carl Pettersson (13,14), Scott Piercy (13,14), Justin Rose (13,14), Brandt Snedeker (13,14), Steve Stricker (13,14), Bo Van Pelt (13,14), Nick Watney (13,14) Tim Clark (14), George Coetzee (14), Nicolas Colsaerts (14), Jason Day (14), Jamie Donaldson (14), Gonzalo