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
2009 Gerry Weber Open and Marseille winner Jo-Wilfried Tsonga, Munich champion Tomáš Berdych, Dmitry Tursunov, Jürgen Melzer and Rainer Schüttler. Association of Tennis Professionals (ATP) No. 2 Roger Federer, reigning US Open champion, winner of the Madrid Open and runner-up in the 2009 Australian Open, was initially in the draw as the top seed, but pulled out before playing a match, citing fatigue after winning the French Open the previous week. The doubles draw was led by 2009 French Open champions, US Open, Rotterdam, and 2008 Halle finalists Lukáš Dlouhý and Leander Paes. Also present were Acapulco winners František Čermák and Michal Mertiňák, Martin