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Switzerland's Roger Federer celebrates after winning against Andy Roddick from the US during their Swiss Indoors ATP tennis tournament match on November 4, 2011, in Basel. Federer won 6-3, 6-2.

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ROTTERDAM, NETHERLANDS - FEBRUARY 16: Roger Federer of Switzerland walks out to play against Igor Sijsling of Holland in their exhibition / demostration match on day 4 during the ABN AMRO World Tennis Tournament on February 16, 2012 in Rotterdam, Netherlands.

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ROTTERDAM, NETHERLANDS - FEBRUARY 16: Roger Federer of Switzerland in action against Igor Sijsling of Holland in their exhibition / demostration match on day 4 during the ABN AMRO World Tennis Tournament on February 16, 2012 in Rotterdam, Netherlands.

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Roger Federer of Switzerland serves to Igor Sijsling of the Netherlands during an exhibition tennis match at the World Indoor Tournament in Rotterdam February 16, 2012.

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Switzerland Roger Federer gives a thumb up to spectators as he leaves the court after he won against Finland's Jarkko Nieminen during a Swiss Indoors ATP tennis tournament match on November 2, 2011 in Basel. Federer won 6-1, 4-6, 6-3.

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Switzerland's Roger Federer reacts after winning against Finland's Jarkko Nieminen during a Swiss Indoors ATP tennis tournament match on November 2, 2011 in Basel. Federer won 6-1, 4-6, 6-3.

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Switzerland's Roger Federer waves at the public as he arrives on the court to play against Finland's Jarkko Nieminen during the Swiss Indoors ATP tennis tournament on November 2, 2011 in Basel. Federer won 6-1, 4-6, 6-3.

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Roger Federer from Switzerland returns a ball to Igor Sijsling from the Netherlands during a demonstration game at the ABN Amro tennis tournament at AHOY stadium in Rotterdam, Netherlands, Thursday, Feb. 16, 2012.

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Roger Federer from Switzerland, second from left in foreground, signs autographs for supporters after a demonstration match against Igor Sijsling from the Netherlands during the ABN Amro tennis tournament at AHOY stadium in Rotterdam, Netherlands, Thursday, Feb. 16, 2012.

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Switzerland's Roger Federer greets spectators at the end of the first round match in which he defeated France's Nicolas Mahut in two sets 6-4, 6-4, at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012.

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Switzerland's Roger Federer acknowledges the cheers of the crowd at the end of the first round match in which he defeated France's Nicolas Mahut in two sets 6-4, 6-4, at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012.

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Swiss player Roger Federer smiles after he defeated French player Nicolas Mahut 6-4, 6-4 during the ATP Rotterdam tennis Open on February 15, 2012 in Rotterdam.

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French player Nicolas Mahut returns the ball to Swiss player Roger Federer during the ATP Rotterdam tennis Open on February 15, 2012 in Rotterdam. Federer won 6-4, 6-4.

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Switzerland's Roger Federer answers questions during a short interview at the end of the first round match in which he defeated France's Nicolas Mahut in two sets 6-4, 6-4, at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012.

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Switzerland's Roger Federer hits ball in the crowd after defeating France's Nicolas Mahut in two sets 6-4, 6-4, in their first round tennis match at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012.

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Switzerland's Roger Federer signs autographs after defeating France's Nicolas Mahut in two sets 6-4, 6-4, during their first round tennis match at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012.

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Switzerland's Roger Federer prepares to serve against France's Nicolas Mahut during their first round tennis match at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012. Federer won in two sets, 6-4, 6-4.

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Roger Federer of Switzerland serves to Nicolas Mahut of France during their men's singles tennis match at the World Indoor Tournament in Rotterdam February 15, 2012.

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Roger Federer of Switzerland reacts at matchpoint during his men's singles tennis match against Nicolas Mahut of France at the World Indoor Tournament in Rotterdam February 15, 2012. Federer beat Mahut 6-4 6-4.

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French player Nicolas Mahut returns a ball to Swiss player Roger Federer uring their first round match of the ATP Rotterdam tennis Open on February 15, 2012 in Rotterdam.

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Switzerland's Roger Federer greets spectators prior to his first round match against France's Nicolas Mahut at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012.

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Swiss player Roger Federer reacts during the first round match against French player Nicolas Mahut at the ATP Rotterdam tennis Open on February 15, 2012 in Rotterdam.

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Switzerland's Roger Federer returns a shot to France's Nicolas Mahut during their first round tennis match at the ABN AMRO tournament at the Ahoy Arena in Rotterdam, Netherlands, Wednesday, Feb. 15, 2012.

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Switzerland's Roger Federer speaks during a press conference on the first day of the ABN AMRO World Tennis Tournament in Rotterdam on February 13, 2012.

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Juan Martin del Potro of Argentina covers his face when seeing the replay of the Hawkeye electronic judging system after challenging a linesman's call in his match against Roger Federer of Switzerland during the final at the ABN AMRO tournament at the Ahoy Arena in Rotterdam,...