Agnieszka Radwanska breaks racket in half during Australian Open

Sloane Stephens of the U.S. plays a forehand to Anabel Medina Garrigues of Spain in the women’s singles match during day three of the Hopman Cup at Perth Arena on Dec. 30 in Perth, Australia.   (Paul Kane / Getty Images)

Gael Monfils of France receives medical treatment during his men’s singles tennis match against Novak Djokovic of Serbia at the Shanghai Masters tennis tournament in Shanghai October 11, 2013.   (ALY SONG / REUTERS)

Serena Williams reacts after winning a game during her match against Francesca Schiavone of Italy at the China Open tennis tournament in Beijing October 1, 2013.   (PETAR KUJUNDZIC / REUTERS)

Aleksandra Wozniak of Canada eyes the ball as she returns a shot against Agnieszka Radwanska of Poland during their women’s singles match at the Pan Pacific Open tennis tournament in Tokyo September 24, 2013.   (Toru Hanai / REUTERS)

Czech Republic’s Radek Stepanek (L) and Argentina’s team captain Martin Jaite chat as they stand near the Davis Cup following the draw for the Davis Cup semifinals in Prague September 12, 2013. Czech Republic will face Argentina in the Davis Cup semifinal match on Friday.   (DAVID W CERNY / REUTERS)

Novak Djokovic of Serbia hits a return to Rafael Nadal of Spain during their men’s final match at the U.S. Open tennis championships in New York, September 9, 2013.   (EDUARDO MUNOZ / REUTERS)

Flavia Pennetta of Italy is congratulated by fellow Italian Roberta Vinci after her victory at the U.S. Open tennis championships in New York September 4, 2013.   (EDUARDO MUNOZ / REUTERS)

Victoria Azarenka of Belarus returns a shot during her first-round match at the US Open on Aug. 29.  (Stan Honda/AFP/Getty Images)

First lady Michelle Obama, right, enjoys Arthur Ashe Kids’ Day on Aug. 24, alongside Jeannie Ashe , center, and her daughter, Camera Ashe.   (Eric Thayer /Reuters)

Cue the Bee Gees tune as Argentina’s Juan Martin Del Potro hits a return during quarter final play at the Cincinnati Open on Aug. 16.  (John Sommers /Reuters)

Roger Federer of Switzerland hits a return to Philipp Kohlschreiber of Germany during their men’s singles match at the Cincinnati Open tennis tournament in Cincinnati, Ohio August 13, 2013.   (JOHN SOMMERS II / REUTERS)

Serena Williams poses with the Rogers Cup after her win over Sorana Cirstea of Romania in the final at Rexall Centre at York University in Toronto, Ontario.  (GEOFF ROBINS/AFP/Getty Images)

Andy Murray celebrates after defeating Novak Djokovic in their men’s singles final tennis match at the Wimbledon Tennis Championships in London on July 7.  (Stefan Wermuth/Reuters)

Andy Murray, right, embraces Novak Djokovic after defeating him in their men’s singles final tennis match at the Wimbledon Tennis Championships in London on July 7.  (Stefan Wermuth/Reuters)

Andy Murray of Great Britain celebrates victory during the Gentlemen’s Singles quarter-final match against Fernando Verdasco of Spain on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 3, 2013 in London, England.   (Clive Brunskill/Getty Images)

Five-time champion Serena Williams was sent packing from Wimbledon on Monday after losing to German Sabine Lisicki.  (Toby Melville/Reuters)

Maria Sharapova of Russia slips during her women’s singles tennis match against Michelle Larcher De Brito of Portugal at the Wimbledon Tennis Championships, in London June 26, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS TPX IMAGES OF THE DAY)  (STEFAN WERMUTH / REUTERS)

Rafael Nadal of Spain reacts during his men’s singles tennis match against Steve Darcis of Belgium at the Wimbledon Tennis Championships, in London.  (Eddie Keogh/Reuters)

Serena Williams of the U.S. warms up before her women’s singles tennis match against Caroline Garcia of France at the Wimbledon Tennis Championships, in London June 27, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: ENTERTAINMENT FASHION SOCIETY SPORT TENNIS)  (STEFAN WERMUTH / REUTERS)

Angelique Kerber of Germany in action against Ekaterina Makarova of Russia during day five of the AEGON International tennis tournament at Devonshire Park on June 19, 2013 in Eastbourne, England.   (Jan Kruger/Getty Images)

France’s Jo-Wilfried Tsonga celebrates winning his men’s singles tennis match against Igor Sijsling from Netherlands at the Queen’s Club Championships in west London June 13, 2013. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT TENNIS)  (EDDIE KEOGH / REUTERS)

Rafael Nadal of Spain celebrates match point during the Men’s Singles final match against David Ferrer of Spain on day fifteen of the French Open at Roland Garros on June 9, 2013 in Paris, France.  (Julian Finney / Getty Images)

Maria Sharapova shows she’s ready to play during the singles final match against Serena Williams at the French Open on June 8.  (Gonzalo Fuentes/Reuters)

France’s Jo-Wilfried Tsonga plays against Spain’s David Ferrer during the other semi-final match at the French Open on June 7.  (Thomas Coex/AFP/Getty Images)

A ball boy holds a broken racket belonging to Stanislas Wawrinka of Switzerland during his men’s singles quarter-final match against Rafael Nadal of Spain at the French Open tennis tournament at the Roland Garros stadium in Paris. Wawrinka repeatedly smashed his racket against the court following a lost point to Nadal.  (Vincent Kessler /Reuters)

Spain’s Rafael Nadal reacts after missing a close shot against during his French tennis Open semi-final match on June 7, in Paris.  (Kenzo Tribouillard/AFP/Getty Images)

Maria Sharapova of Russia (R) and Victoria Azarenka of Belarus (L) are pictured during their women’s singles semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2013. REUTERS/Stephane Mahe (FRANCE - Tags: SPORT TENNIS TPX IMAGES OF THE DAY)  (STEPHANE MAHE / REUTERS)

Even the ball boys (and girls) at the French Open need a rest. Here a ball boy takes a much needed break at Roland Garros stadium on May 31.  (Thomas Coex/AFP/Getty Images)

Germany’s Angelique Kerber returns a shot during her French Open match on May 31.   (Kenzo Tribouillard/AFP/Getty Images)

A close up shot shows the shoes of France’s Gael Monfils playing on the famous red clay courts of Roland Garros at the French Open.   (Stephane Mahe/Reuters)

Serena Williams breezed past Sorana Cirstea 6-0 6-2 in the French Open third round on May 31, extending her winning streak to 27 matches.  (Photo by Clive Brunskill/Getty Images)

A stadium ball bounces off the tarpaulin covering center court at Roland Garros stadium in Paris on May 30 as rain halts play on day five of the French Open.   (Thomas Coex/AFP/Getty Images)

USA’s Serena Williams serves to Georgia’s Anna Tatishvili during a French tennis Open first round match on May 26, 2013 at the Roland Garros stadium in Paris.   (Patrick Kovarik/AFP Photo/Getty Images)

Serena Williams of the U.S. holds the trophy after winning the women’s singles final match against Victoria Azarenka of Belarus at the Rome Masters tennis tournament May 19, 2013. Williams won 6-1 6-3.   (Alessandro Bianchi/Reuters)

Rafael Nadal of Spain in action during his third round match against Ernests Gulbis of Latvia on day five of the Internazionali BNL d’Italia 2013 at the Foro Italico Tennis Centre on May 16, 2013 in Rome, Italy.   (Clive Mason/Getty Images)

Laura Robson of Great Britain plays a backhand against Venus Williams of the USA in their first round match during day two of the Internazionali BNL d’Italia 2013 at the Foro Italico Tennis Centre on May 13, 2013 in Rome, Italy.   (Clive Brunskill/Getty Images)

Rafael Nadal of Spain celebrates winning a point against Mikhail Youzhny of Russia during their men’s singles match at the Madrid Open tennis tournament, May 9, 2013. REUTERS/Susana Vera (SPAIN - Tags: SPORT TENNIS TPX IMAGES OF THE DAY)  (SUSANA VERA / REUTERS)

Milos Raonic of Canada reacts after winning over Andreas Seppi of Italy at the Davis Cup World Group, 3rd Singles Rubber, on April 7, 2013 at the Doug Mitchell Thunderbird Sports Centre, in Vancouver British Columbia, Canada.   (Don MacKinnon/AFP/Getty Images)

Caroline Wozniacki of Denmark returns a shot to Agnieszka Radwanska (not seen) of Poland during their BNP Paribas Showdown tennis friendly match in Hong Kong March 4, 2013.   (Tyrone Siu/Reuters)

Switzerland’s Roger Federer returns the ball to Russia’s Nikolay Davydenko during their ATP Dubai Open tennis quarter final match in the Gulf emirate on February 28, 2013.   (Marwan Naamani/AFP/Getty Images)

Spain’s Roberto Bautista Agut hits a return to Serbia’s Novak Djokovic during their ATP Dubai Open tennis match in the Gulf emirate on February 27, 2013.   (Marwan Naamani/AFP/Getty Images)

Argentina’s Juan Martin Del Potro serves to Cyprus’ Marcos Baghdatis during their ATP Dubai Open tennis match in the Gulf emirate on February 26, 2013.   (Karim Sahib/AFP/Getty Images)

Switzerland’s Roger Federer serves the ball to Tunisian Malek Jaziri during the tennis match of the ATP Dubai Open in the Gulf emirate on February 25, 2013.   (Karim Sahib/AFP/Getty Images)

Spanish tennis player Rafael Nadal returns the ball to Argentine Horacio Zeballos at the ATP Vina del Mar tournament final singles match, in Vina del Mar, about 120 km northwest of Santiago, on February 10, 2013.   (Martin Bernetti/AFP/Getty)

Samantha Stosur (AUS) returns a shot against Jie Zheng (CHN) on day three of the 2013 Australian Open  (Matthias Hauer/GEPA via USA TODAY Sports)

Czech Republic’s Radek Stepanek (bottom) and Tomas Berdych play with the trophy after winning the Davis Cup tennis tournament final match over Spain in Prague November 18, 2012.   (David W. Cerny/Reutesr)

Roger Federer of Switzerland hits a return to Novak Djokovic of Serbia in their championship match at the men’s Cincinnati Open tennis tournament in Cincinnati, Ohio August 19, 2012.   (John Sommers II/Reuters)

Venus Williams hits a forehand against Maria Kirilenko of Russia during day four of the Western & Southern Open at Lindner Family Tennis Center on August 14, 2012 in Mason, Ohio.   (Nick Laham/Getty Images)

Jo-Wilfried Tsonga of France returns a shot to Jeremy Chardy of France during their match at the Toronto Masters tennis tournament in Toronto August 8, 2012.   (Mike Casses/Reuters)

Serena Williams of the U.S. hits a backhand shot against compatriot Coco Vandeweghe during the finals of the Stanford women’s tennis tournament on the Stanford University campus in Palo Alto, California July 15, 2012.   (Robert Galbraith/Reuters)

Serena Williams of the U.S. holds her trophy after defeating Agnieszka Radwanska of Poland in their women’s final tennis match at the Wimbledon tennis championships in London July 7, 2012.   (Dylan Martinez/Reuters)

Jo-Wilfried Tsonga of France hits a return to Mardy Fish of the U.S. during their men’s singles tennis match at the Wimbledon tennis championships in London July 3, 2012.   (Dylan Martinez/Reuters)

Serbia’s Novak Djokovic plays a forehand shot during his second round men’s singles match against US player Ryan Harrison on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.   (Andrew Yates/Getty Images)

Oliver Golding of Britain hits a return to Igor Andreev of Russia during their men’s singles tennis match at the Wimbledon tennis championships in London June 25, 2012.   (Toby Melville/Reuters)

Tommy Haas of Germany reacts returns a ball to Switzerland’s Roger Federer during their final match at the ATP Gerry Weber Open tennis tournament in Halle, western Germany, on June 17, 2012. Haas won the match 7-6 (7/5), 6-4. AFP PHOTO / CARMEN JASPERSEN (Photo credit should read CARMEN JASPERSEN/AFP/GettyImages)   (Carmen Jaspersen/AFP/Gettyimages)

Rafael Nadal of Spain celebrates after winning a record seventh French Open title.   (Francois Lenoir/Reuters)

Maria Sharapova of Russia poses with the trophy during the ceremony after defeating Sara Errani of Italy during their women’s singles final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 9, 2012.   (Benoit Tessier/Reuters)

Czech Republic’s Petra Kvitova hits a return to Russia’s Maria Sharapova during their Women’s Singles semifinal tennis match of the French Open tennis tournament at the Roland Garros stadium, on June 7, 2012 in Paris.  (Jacques DeMarthon/AFP/Gettyimages)

Venus Williams hits a return to Poland’s Agnieszka Radwanska during their Women’s Singles 2nd Round tennis match of the French Open tennis tournament at the Roland Garros stadium, on May 30, 2012 in Paris.   (Kenzo Tribouillard/AFP/Getty Images)

Caroline Wozniacki serves against Eleni Daniilidou on day three of the 2012 French Open at Roland Garros.  (Matthias Hauer/GEPA via US PRESSWIRE)