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 US Open – Men's Singles final. Roger Federer's streak of nine consecutive US Open quarterfinals ended when he lost to Tommy Robredo in the fourth round, marking his earliest exit from the tournament since 2003. Novak Djokovic "(Final)" 2013 US Open – Men's Singles Andy Murray was the defending champion, but was defeated in the quarterfinals by Stan Wawrinka. Rafael Nadal won the title, defeating Novak Djokovic in the final to claim a second US Open title and win his thirteenth grand slam. The win moved him to 13 grand slam titles, and moved to third place on the all time men's singles Grand Slam