Poland's Lukasz Kubot reacts during a match with Argentina's Carlos Berlocq during their men's second round match in the French Open tennis championship at the Roland Garros stadium, on May 26, 2011, in Paris. AFP PHOTO / ALEXANDER KLEIN

Polish player Lukasz Kubot gestures to French player Gael Monfils during the men's single at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 25, 2011. AFP PHOTO / BEN STANSALL RESTRICTED TO EDITORIAL USE

Bildnummer: 08179348 Datum: 15.07.2011 Copyright: imago/Michael Weber Lukasz KUBOT POL Freisteller, Einzelbild, Aktion Viertelfinale Lukasz KUBOT POL vs Santiago GIRALDO COL Tennis Mercedes-Cup Stuttgart Wei?enhof 09.-17.17.2011 ; Tennis MercedesCup Stuttgart xdp x1x 2011 quadrat premiumd Image number 08179348 date 15 07 2011 Copyright imago Michael Weber Lukasz Kubot POL cut out Single Action shot Quarter-finals Lukasz Kubot POL vs Santiago Giraldo Col Tennis Mercedes Cup Stuttgart Wei?enhof 09 17 17 2011 Tennis MercedesCup Stuttgart x1x 2011 Square premiumd

Poland's Lukasz Kubot hits a return to Belgium's David Goffin during their Men's Singles 3rd Round tennis match of the French Open tennis tournament at the Roland Garros stadium, on June 1, 2012 in Paris. AFP PHOTO / THOMAS COEX

Agnieszka Radwanska of Poland, currently No 2 in the WTA singles ranking, talks with the media during a news conference in Warsaw, Poland, Saturday, July 14, 2012. (AP Photo/Alik Keplicz)

Urszula Radwanska, of Poland, returns to Coco Vandeweghe, of the United States, during a quarterfinal match of the Bank of the West tennis tournament on Friday, July 13, 2012 in Stanford, Calif. Vaneweghe won 6-4, 6-4. (AP Photo/Marcio Jose Sanchez)

Urszula Radwanska, of Poland, celebrates after beating Marina Erakovic, of New Zealand, in the Bank of the West tennis tournament on Thursday, July 12, 2012 in Stanford, Calif. Radwanska won 6-3, 3-6, 6-4.(AP Photo/Marcio Jose Sanchez)

Urszula Radwanska, of Poland, serves to Marina Erakovic, of New Zealand, during the Bank of the West tennis tournament Thursday, July 12, 2012, in Stanford, Calif. (AP Photo/Marcio Jose Sanchez)

Agnieszka Radwanska of Poland returns a shot to Angelique Kerber of Germany during a semifinals match at the All England Lawn Tennis Championships at Wimbledon, England, Thursday, July 5, 2012. (AP Photo/Alastair Grant)

Urszula Radwanska of Poland returns in her second round match against Petra Kvitova of the Czech Republic at the French Open tennis tournament in Roland Garros stadium in Paris, Thursday May 31, 2012. (AP Photo/Bernat Armangue)

Bildnummer: 10569880 Datum: 13.05.2012 Copyright: imago/Alterphotos ATP Doubles Final Robert Lindstedt and Horia Tecau vs Mariusz Fyrstenberg and Marcin Matwowski during Mutua Madrid Open 2012 on may 13th 2012...Photo: Cesar Cebolla / ALFAQUI PUBLICATIONxINxGERxSUIxAUTxPOLxDENxNORxSWExONLY (185886); Tennis xmk x1x 2012 hoch Aufmacher Image number 10569880 date 13 05 2012 Copyright imago Old photos ATP Doubles Final Robert Lindstedt and Horia Tecau vs Mariusz Fyrstenberg and Marcin during Mutua Madrid Open 2012 ON May 13th 2012 Photo Cesar Cebolla PUBLICATIONxINxGERxSUIxAUTxPOLxDENxNORxSWExONLY Tennis xmk x1x 2012 vertical Highlight

PHOTO: PIOTR GAJEK / EAST NEWS PORTRET MARIUSZ FYRSTENBERG WARSZAWA 07.02.2012

PHOTO: PIOTR GAJEK / EAST NEWS PORTRET MARCIN MATKOWSKI WARSZAWA 07.02.2012

PHOTO: PIOTR GAJEK / EAST NEWS PORTRET MARCIN MATKOWSKI (L) I MARIUSZ FYRSTENBERG WARSZAWA 07.02.2012

PHOTO: PIOTR GAJEK / EAST NEWS PORTRET MARCIN MATKOWSKI (L) I MARIUSZ FYRSTENBERG WARSZAWA 07.02.2012

PHOTO: PIOTR GAJEK / EAST NEWS PORTRET MARCIN MATKOWSKI WARSZAWA 07.02.2012

PHOTO: PIOTR GAJEK / EAST NEWS PORTRET MARIUSZ FYRSTENBERG WARSZAWA 07.02.2012

PHOTO: WOJCIECH KUBIK/EAST NEWS NOWY JORK 31.08.2011. US OPEN 2011, PIERWSZA RUNDA DEBLA KOBIET. N/Z: KLAUDIA JANS - IGNACIK, ALICJA ROSOLSKA

PHOTO: WOJCIECH KUBIK/EAST NEWS 02.09.2010, US Open 2010, 2 runda, Debel Alberta Brianti /Urszula Radwanska n/z: Urszula Radwanska i Alberta Brianti

PHOTO: WOJCIECH KUBIK/EAST NEWS A.GROENFELD / P.SCHNYDER WYGRALY Z K.JANS / A.ROSOLSKA 6:2 ; 6:2 W MECZU 2-GIEJ RUNDY DEBLA KOBIET TURNIEJU WIELKOSZLEMOWEGO US OPEN 2009 N/Z: KLAUDIA JANS/ ALICJA ROSOLSKA