![Switzerland's Davis Cup team member Roger Federer hits a return to Stanislas Wawrinka during a practice session in Fribourg, February 8, 2012. Switzerland will meet the U.S. in the Davis Cup tennis Switzerland's Davis Cup team member Roger Federer hits a return to Stanislas Wawrinka during a practice session in Fribourg, February 8, 2012. Switzerland will meet the U.S. in the Davis Cup tennis](https://c8.alamy.com/comp/2E6E73C/switzerlands-davis-cup-team-member-roger-federer-hits-a-return-to-stanislas-wawrinka-during-a-practice-session-in-fribourg-february-8-2012-switzerland-will-meet-the-us-in-the-davis-cup-tennis-tournament-on-february-10-12-reutersmichael-buholzer-switzerland-tags-sport-tennis-2E6E73C.jpg)
Switzerland's Davis Cup team member Roger Federer hits a return to Stanislas Wawrinka during a practice session in Fribourg, February 8, 2012. Switzerland will meet the U.S. in the Davis Cup tennis
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John Isner of the U.S. serves to Switzerland's Roger Federer during their Davis Cup tennis match in Fribourg, February 10, 2012. REUTERS/Michael Buholzer (SWITZERLAND - Tags: SPORT TENNIS Stock Photo - Alamy
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MarcAndrea Huesler Switzerland action against Grigor Dimitrov Editorial Stock Photo - Stock Image | Shutterstock
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Switzerland's Stanislas Wawrinka celebrates after beating Finland's Jarkko Nieminen at the Swiss Indoors ATP tennis tournament in Basel November 5, 2009. REUTERS/Christian Hartmann (SWITZERLAND SPORT TENNIS Stock Photo - Alamy
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