Argentina's players Agustin Calleri (R) and David Nalbandian watch the end of the Davis Cup 2008 World Group final match...

MAR DEL PLATA, ARGENTINA - NOVEMBER 22: David Nalbandian (L) and Agustin Calleri of Argentina play Feliciano Lopez and Fernando Verdasco of Spain during the third rubber of the...

...players Feliciano Lopez (R) and Feliciano Lopez return the ball to Argentina's David Nalbandian and Agustin Calleri during the double match of the Davis Cup final, at Islas Malvinas stadium in Mar del...

Nikolay Davydenko of Russia hits to Agustin Calleri of Argentina during their match at the U.S. Open tennis tournament in New York, Friday...

1- NEW YORK - AUGUST 31: Darren Cahill watches as Lleyton Hewitt of Australia takes on Agustin Calleri of Argentina during day five of the 2007 U.S. Open at the Billie Jean King...

United States player Mardy Fish returns the ball during his first round match against Argentina's Agustin Calleri at the French Open tennis tournament in Paris on Wednesday May 28, 2008. (AP Photo/David...

Juan Monaco of Argentina returns a volley to fellow countryman Agustin Calleri at the US Open tennis tournament in New York, Sunday, Sept. 2, 2007

David Nalbandian (center) and Agustin Calleri struggled as Russia moved within a singles win of its second Davis Cup

Agustin Calleri of Argentina celebrates his 6-2, 7-6 (7-2), victory over three-time defending champion...

Agustin Calleri topped Tommy Robredo at the Open Seat Godo tournament