![Argentina's Davis Cup team player Juan Martin del Potro juggles his racket during the team's practice for the Davis Cup World Group quarter-final tennis match in Ostrava July 9, 2009. REUTERS/Petr Josek ( Argentina's Davis Cup team player Juan Martin del Potro juggles his racket during the team's practice for the Davis Cup World Group quarter-final tennis match in Ostrava July 9, 2009. REUTERS/Petr Josek (](https://c8.alamy.com/comp/2E8FHB5/argentinas-davis-cup-team-player-juan-martin-del-potro-juggles-his-racket-during-the-teams-practice-for-the-davis-cup-world-group-quarter-final-tennis-match-in-ostrava-july-9-2009-reuterspetr-josek-czech-republic-sport-tennis-2E8FHB5.jpg)
Argentina's Davis Cup team player Juan Martin del Potro juggles his racket during the team's practice for the Davis Cup World Group quarter-final tennis match in Ostrava July 9, 2009. REUTERS/Petr Josek (
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