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Belarus' tennis player Victoria Azarenka serves to US Serena Williams during the 2013 US Open women's final at the USTA Billie Jean King National Tennis Center in New York on September 8, 2013. EMMANUEL DUNAND/AFP/Getty Images ( 522689460 )

Serena Williams returns a shot to Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournament, Sunday, Sept. 8, 2013, in New York. (AP Photo/Mike Groll) ( US Open Tennis )

Victoria Azarenka of Belarus plays a forehand during her women's singles final match against Serena Williams of the United States of America on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Maddie Meyer/Getty Images) ( 180076110 )

Serena Williams of the United States of America's mother Oracene Price and her sister Venus Williams watch her women's singles final match against Victoria Azarenka of Belarus on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 180074482 )

Arthur Ashe Stadium as military personnel unfurl the national flag before the start of the women's singles final match between Victoria Azarenka of Belarus and Serena Williams of the United States of America on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images) ( 180072607 )

Serena Williams of the United States of America looks on during her women's singles final match against Victoria Azarenka of Belarus on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 180072199 )

Serena Williams prepares to serve against Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournament, Sunday, Sept. 8, 2013, in New York. (AP Photo/Darron Cummings) ( US Open Tennis )

Serena Williams of the United States of America serves during her women's singles final match against Victoria Azarenka of Belarus on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images) ( 180076141 )

Belarus tennis player Victoria Azarenka plays a shot against Serena Williams of the US during the 2013 US Open women's final at the USTA Billie Jean King National Tennis Center in New York on September 8, 2013. EMMANUEL DUNAND/AFP/Getty Images ( 522692810 )

Serena Williams of the United States celebrates winning her women's singles final match against Victoria Azarenka of Belarus on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in New York City. (Photo by Chris Trotman/Getty Images for the USTA) ( 180092213 )

Victoria Azarenka, of Belarus, sits at court side before the trophy presentation after losing to Serena Williams in the women's singles final of the 2013 U.S. Open tennis tournament, Sunday, Sept. 8, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

Sarah Jessica Parker attends the women's singles final match between Victoria Azarenka of Belarus and Serena Williams of the United States of America on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 180078261 )

Serena Williams of the United States of America serves during her women's singles final match against Victoria Azarenka of Belarus on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images) ( 180074275 )

Victoria Azarenka of Belarus plays forehand during her women's singles final match against Serena Williams of the United States of America on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 180072610 )

Serena Williams returns a shot to Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournament, Sunday, Sept. 8, 2013, in New York. (AP Photo/Charles Krupa) ( US Open Tennis )

Victoria Azarenka of Belarus serves during her women's singles final match against Serena Williams of the United States of America on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images) ( 180070997 )

Serena Williams of the US serves to Victoria Azarenka of Belarus during their 2013 US Open women's singles final match at the USTA Billie Jean King National Tennis Center September 8, 2013 in New York. STAN HONDA/AFP/Getty Images ( 522685887 )

US tennis player Serena Williams plays a point against Belarus' Victoria Azarenka during the 2013 US Open women's final at the USTA Billie Jean King National Tennis Center in New York on September 8, 2013. EMMANUEL DUNAND/AFP/Getty Images ( 522694577 )

Serena Williams of the US celebrates her win over Victoria Azarenka of Belarus during their 2013 US Open women's singles final match at the USTA Billie Jean King National Tennis Center September 8, 2013 in New York. STAN HONDA/AFP/Getty Images ( 522703915 )

Serena Williams reacts after defeating Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournament, Sunday, Sept. 8, 2013, in New York. (AP Photo/Darron Cummings) ( US Open Tennis )

Serena Williams of the United States of America celebrates winning her women's singles final match against Victoria Azarenka of Belarus on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Maddie Meyer/Getty Images) ( 180082942 )

Serena Williams of the US holds the trophy as she celebrates her win over Victoria Azarenka of Belarus during their 2013 US Open women's singles final match at the USTA Billie Jean King National Tennis Center September 8, 2013 in New York. STAN HONDA/AFP/Getty Images ( 522703926 )

Serena Williams holds up the championship trophy after defeating Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournament, Sunday, Sept. 8, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

Victoria Azarenka, of Belarus, holds up the second place trophy after losing to Serena Williams during the women's singles final of the 2013 U.S. Open tennis tournament, Sunday, Sept. 8, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

US tennis player Serena Williams (R) holds her winning trophy while posing with Belarus Victoria Azarenka (L) during the 2013 US Open women's final at the USTA Billie Jean King National Tennis Center in New York on September 8, 2013. EMMANUEL DUNAND/AFP/Getty Images ( 522694320 )

Photographers take pictures of Serena Williams of the United States of America and Victoria Azarenka of Belarus after their women's singles final match on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Maddie Meyer/Getty Images) ( 180084919 )

Victoria Azarenka of Belarus(L) holds the runner-up trophy after being defeated by Serena Williams of the US (R) during their 2013 US Open women's singles final match at the USTA Billie Jean King National Tennis Center September 8, 2013 in New York. STAN HONDA/AFP/Getty Images ( 522695022 )

Former President Bill Clinton congratulates Serena Williams of the United States after her women's singles final victory on Day Fourteen of the 2013 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2013 in New York City. (Photo by Chris Trotman/Getty Images for the USTA) ( 180090090 )

2013 US Open Champion Serena Williams of the United States enters from the street to her appearace on the "CBS This Morning" show on her New York City Trophy Tour on September 9, 2013 in New York City. (Photo by Joe Scarnici/Getty Images) ( 180135737 )

2013 US Open Champion Serena Williams of the United States poses for a photo with TV Personality Robin Roberts backstage of the "Good Morning America" show on her New York City Trophy Tour on September 9, 2013 in New York City. (Photo by Joe Scarnici/Getty Images) ( 180135736 )

2013 U.S. Open Women's Singles tennis champion Serena Williams poses with her trophy in Central Park, Monday, Sept. 9, 2013, in New York. Williams defeated Victoria Azarenka 7-5, 6-7 (6), 6-1 on Sunday. (AP Photo/David Goldman) ( US Open Tennis )