Serena Williams at the All England Club

Serena Williams of the USA looks on during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Clive Rose/Getty Images)

Serena Williams of the USA lifts the winners trophy and celebrates after her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Clive Rose/Getty Images)

Serena Williams of the USA celebrates match point during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Anja Niedringhaus/Pool/Getty Images)

Serena Williams of the USA serves the ball during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Clive Rose/Getty Images)

Serena Williams (R) of the USA celebrates with her father Richard Williams after her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Clive Rose/Getty Images)

Five times Wimbledon Ladies Champion Serena Williams attends the Wimbledon Championships 2012 Winners Ball at the InterContinental Park Lane Hotel on July 8, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)

Serena Williams of the USA serves the ball during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA hits a forehand return during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA hits a backhand return during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Clive Rose/Getty Images)

Serena Williams of the USA jumps in the air with the winners trophy and celebrates after her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA hits a forehand return during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA celebrates a point during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA holds the winners trophy and celebrates whilst speaking to Sue Barker after her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA slips to the ground during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA celebrates match point during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA celebrates match point during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Clive Rose/Getty Images)

Serena Williams of the USA holds the winners trophy after her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA shows her frustration during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA lifts the winners trophy and celebrates after her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Anja Niedringhaus/Pool/Getty Images)

Serena Williams of the USA serves the ball during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA lifts the winners trophy and celebrates after her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Anja Niedringhaus/Pool/Getty Images)

Serena Williams of the USA is congratulated by Agnieszka Radwanska of Poland after her Ladies Singles final match on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Anja Niedringhaus/Pool/Getty Images)

Serena Williams of the USA returns the ball during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Anja Niedringhaus/Pool/Getty Images)

Serena Williams of the USA returns the ball during her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Anja Niedringhaus/Pool/Getty Images)

Serena Williams of the USA speaks at a press conference after winning her Ladies Singles final match against Agnieszka Radwanska of Poland on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Pool/Getty Images)

Serena Williams (L) and Venus Williams of the USA celebrate with their winners trophies after their Ladies Doubles final match against Andrea Hlavackova and Lucie Hradecka of the Czech Republic on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serena Williams of the USA hits a volley during their Ladies Doubles final match against Andrea Hlavackova and Lucie Hradecka of the Czech Republic on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 7, 2012 in London, England. (Photo by Julian Finney/Getty Images)