KEY BISCAYNE, FL - MARCH 29: Roger Federer of Switzerland looks on against Nicolas Kiefer of Germany during the third round of the Sony Ericsson Open at the Crandon Park Tennis...

KEY BISCAYNE, FL - MARCH 29: Roger Federer of Switzerland looks on against Nicolas Kiefer of Germany during the third round of the Sony Ericsson Open at the Crandon Park Tennis...

1- 29 March 2009: Roger Federer plays against Nicolas Kiefer in the third round of the Sony Ericsson Open at the Tennis Center at Crandon Park...

James Blake of the USA smashes a forehand to Nicolas Kiefer of Germany in their singles match on Session 7 of the Hopman Cup in Perth on...

PERTH, AUSTRALIA - JANUARY 07: James Blake of the USA waits to return serve to Nicolas Kiefer of Germany during the 2009 Hopman Cup day five men's singles match between Germany and...

...27, 2008; Toronto, ON, Canada; Rafael Nadal (ESP) celebrates with the Rogers Cup trophy after defeating Nicolas Kiefer (GER) (not pictured) during the final of the Rogers Cup at the Rexall Centre in Toronto...

...Nicolas Massu of Chile show off their gold medals after they defeated the German team of Nicolas Kiefer and Rainer Schuettler at the 2004 Olympic Games in Athens Saturday, Aug. 21, 2004

...JUNE 28: Rafael Nadal of Spain celebrates winning the men's singles round three match against Nicolas Kiefer of Germany on day six of the Wimbledon Lawn Tennis Championships at the All England Lawn...

Nicolas Kiefer's advance to the semis has been laced with drama

Nicolas Kiefer fell to eventual champ Roger Federer at Wimbledon

Roger Federer dropped a set to 25th seed Nicolas Kiefer

Roddick advanced with a 7-5, 6-3 win over Nicolas Kiefer

Andy Roddick returns a shot during a second-round match with Nicolas Kiefer at the Masters Series-Cincinnati in Mason, Ohio. Roddick beat Kiefer 6-4, 6-3

Chile's Fernando Gonzalez, right, and Nicolas Massu celebrate after defeating Germany's Nicholas Kiefer and Rainer Schuettler in the men's gold medal doubles match at the...