![World number one player Andy Roddick (R) of the U.S. listens with compatriot Andre Agassi (L) and Roger Federer (C) from Switzerland to questions during a media conference in Melbourne January 13, World number one player Andy Roddick (R) of the U.S. listens with compatriot Andre Agassi (L) and Roger Federer (C) from Switzerland to questions during a media conference in Melbourne January 13,](https://c8.alamy.com/comp/2D4JK31/world-number-one-player-andy-roddick-r-of-the-us-listens-with-compatriot-andre-agassi-l-and-roger-federer-c-from-switzerland-to-questions-during-a-media-conference-in-melbourne-january-13-2004-roddick-says-doping-is-not-a-problem-in-tennis-even-though-britains-greg-rusedski-and-mariano-puerta-of-argentina-have-recently-tested-positive-for-banned-drugs-i-know-the-players-who-i-play-with-are-clean-roddick-told-reporters-as-he-prepared-for-the-kooyong-classic-exhibition-event-which-begins-here-on-wednesday-reutersdavid-gray-dgcp-2D4JK31.jpg)
World number one player Andy Roddick (R) of the U.S. listens with compatriot Andre Agassi (L) and Roger Federer (C) from Switzerland to questions during a media conference in Melbourne January 13,
![Argentina's Mariano Puerta returns the ball to compatriot Juan Ignacio Chela during their Petrobras Challenge tennis tournament semi final match on the Copacabana beach in Rio de Janeiro December 8, 2005. REUTERS/Bruno Argentina's Mariano Puerta returns the ball to compatriot Juan Ignacio Chela during their Petrobras Challenge tennis tournament semi final match on the Copacabana beach in Rio de Janeiro December 8, 2005. REUTERS/Bruno](https://c8.alamy.com/comp/2E8GDJG/argentinas-mariano-puerta-returns-the-ball-to-compatriot-juan-ignacio-chela-during-their-petrobras-challenge-tennis-tournament-semi-final-match-on-the-copacabana-beach-in-rio-de-janeiro-december-8-2005-reutersbruno-domingos-2E8GDJG.jpg)
Argentina's Mariano Puerta returns the ball to compatriot Juan Ignacio Chela during their Petrobras Challenge tennis tournament semi final match on the Copacabana beach in Rio de Janeiro December 8, 2005. REUTERS/Bruno
![Argentine tennis player Mariano Puerta celebrates after winning his match against Argentine Franco Squillari in the Mexican Open, February 26, in Mexico City. Puerta won 6-4 6-1. HR Stock Photo - Alamy Argentine tennis player Mariano Puerta celebrates after winning his match against Argentine Franco Squillari in the Mexican Open, February 26, in Mexico City. Puerta won 6-4 6-1. HR Stock Photo - Alamy](https://c8.alamy.com/comp/2D59KR4/argentine-tennis-player-mariano-puerta-celebrates-after-winning-his-match-against-argentine-franco-squillari-in-the-mexican-open-february-26-in-mexico-city-puerta-won-6-4-6-1-hr-2D59KR4.jpg)
Argentine tennis player Mariano Puerta celebrates after winning his match against Argentine Franco Squillari in the Mexican Open, February 26, in Mexico City. Puerta won 6-4 6-1. HR Stock Photo - Alamy
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Switzerland's Stanislas Wawrinka returns a backhand to [Argentina's Mariano Puerta] during their match in the third round of the French Open tennis tournament at the Roland Garros stadium May 28, 2005 Stock
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![Switzerland's Stanislas Wawrinka returns a forehand during his match against Germany's Andreas Beck at the Swiss Indoors ATP tennis tournament in Basel October 20, 2008. REUTERS/Christian Hartmann (SWITZERLAND Stock Photo - Alamy Switzerland's Stanislas Wawrinka returns a forehand during his match against Germany's Andreas Beck at the Swiss Indoors ATP tennis tournament in Basel October 20, 2008. REUTERS/Christian Hartmann (SWITZERLAND Stock Photo - Alamy](https://l450v.alamy.com/450v/2d4er77/switzerlands-stanislas-wawrinka-returns-a-forehand-to-argentinas-mariano-puerta-during-their-match-in-the-third-round-of-the-french-open-tennis-tournament-at-the-roland-garros-stadium-may-28-2005-2d4er77.jpg)