![Jurgen Melzer, of Austria, returns a shot against Mariano Zabaleta, of Argentina, during their U.S. Men's Clay Court Championships quarterfinals tennis match Friday, April 13, 2007, in Houston. (AP Photo/David J. Phillip Jurgen Melzer, of Austria, returns a shot against Mariano Zabaleta, of Argentina, during their U.S. Men's Clay Court Championships quarterfinals tennis match Friday, April 13, 2007, in Houston. (AP Photo/David J. Phillip](https://c8.alamy.com/comp/2PBMHHF/jurgen-melzer-of-austria-returns-a-shot-against-mariano-zabaleta-of-argentina-during-their-us-mens-clay-court-championships-quarterfinals-tennis-match-friday-april-13-2007-in-houston-ap-photodavid-j-phillip-2PBMHHF.jpg)
Jurgen Melzer, of Austria, returns a shot against Mariano Zabaleta, of Argentina, during their U.S. Men's Clay Court Championships quarterfinals tennis match Friday, April 13, 2007, in Houston. (AP Photo/David J. Phillip
![Jurgen Melzer of Austria bounces the tennis ball before he serves to Juan Carlos Ferrero of Spain at the U.S. Open tennis tournament in New York, Saturday, Sept. 4, 2010. (AP Photo/Paul Jurgen Melzer of Austria bounces the tennis ball before he serves to Juan Carlos Ferrero of Spain at the U.S. Open tennis tournament in New York, Saturday, Sept. 4, 2010. (AP Photo/Paul](https://l450v.alamy.com/450v/2nd5xw5/jurgen-melzer-of-austria-bounces-the-tennis-ball-before-he-serves-to-juan-carlos-ferrero-of-spain-at-the-us-open-tennis-tournament-in-new-york-saturday-sept-4-2010-ap-photopaul-j-bereswill-2nd5xw5.jpg)
Jurgen Melzer of Austria bounces the tennis ball before he serves to Juan Carlos Ferrero of Spain at the U.S. Open tennis tournament in New York, Saturday, Sept. 4, 2010. (AP Photo/Paul
![Jurgen Melzer, of Austria, returns the ball during his first round match against Marat Safin at the Pacific Life Open tennis tournament in Indian Wells, Calif., Friday, March 14, 2008. (AP Photo/Mark Jurgen Melzer, of Austria, returns the ball during his first round match against Marat Safin at the Pacific Life Open tennis tournament in Indian Wells, Calif., Friday, March 14, 2008. (AP Photo/Mark](https://c8.alamy.com/comp/2PABRR5/jurgen-melzer-of-austria-returns-the-ball-during-his-first-round-match-against-marat-safin-at-the-pacific-life-open-tennis-tournament-in-indian-wells-calif-friday-march-14-2008-ap-photomark-avery-2PABRR5.jpg)