Poland's Natalia Partyka serves against China's Ding Ning during their women's singles second round match at the World Table Tennis Championships in Suzhou, Jiangsu province April 29, 2015. REUTERS/Aly Song 

China's Ding Ning serves against Poland's Natalia Partyka during their women's singles second round match at the World Table Tennis Championships in Suzhou, Jiangsu province April 29, 2015. REUTERS/Aly Song 

Poland's Natalia Partyka tosses the ball as she serves to Hungary's Szandra Pergel in their women's singles first round match at the World Table Tennis Championships in Suzhou, Jiangsu province April 28, 2015. REUTERS/Aly Song TPX IMAGES OF THE DAY

Poland's Natalia Partyka tosses the ball as she serves to Romania's Bernadette Szocs during the World Team Table Tennis Championships in Tokyo May 1, 2014. REUTERS/Yuya Shino (JAPAN - Tags: SPORT TABLE TENNIS) 

Poland's Natalia Partyka tosses the ball as she serves to China's Liu Shiwen during the World Team Table Tennis Championships in Tokyo April 28, 2014. REUTERS/Yuya Shino (JAPAN - Tags: SPORT TABLE TENNIS) 

China's Liu Shiwen hits a return to Poland's Natalia Partyka during the World Team Table Tennis Championships in Tokyo April 28, 2014. REUTERS/Yuya Shino (JAPAN - Tags: SPORT TABLE TENNIS) 

China's Liu Shiwen hits a return to Poland's Natalia Partyka during the World Team Table Tennis Championships in Tokyo April 28, 2014. REUTERS/Yuya Shino (JAPAN - Tags: SPORT TABLE TENNIS) 

Katarzyna Grzybowska (R) and Natalia Partyka of Poland face Petrissa Solja and Sabine Winter of Germany in their women's doubles match at the World Team Table Tennis Championships in Paris May 16, 2013. The 52nd edition of the World Table Tennis Championships gathers 829 athletes from 162 countries and runs from May 13 to May 20. REUTERS/Charles Platiau (FRANCE - Tags: SPORT TABLE TENNIS) 

Natalia Partyka of Poland serves in her women's doubles match with teammate Katarzyna Grzybowska against Petrissa Solja and Sabine Winter of Germany at the World Team Table Tennis Championships in Paris May 16, 2013. The 52nd edition of the World Table Tennis Championships gathers 829 athletes from 162 countries and runs from May 13 to May 20. REUTERS/Charles Platiau (FRANCE - Tags: SPORT TABLE TENNIS) 

Natalia Partyka of Poland serves in her Women's Singles C10 classification table tennis final against Yang Qian of China at the London 2012 Paralympic Games September 3, 2012. Partyka, the world number one who was a gold medallist both in the 2008 Beijing Olympics and the 2004 Athens Olympics, is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS) 

Natalia Partyka of Poland serves in her Women's Singles C10 classification table tennis final against Yang Qian of China at the London 2012 Paralympic Games September 3, 2012. Partyka won the gold medal, and is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS TPX IMAGES OF THE DAY) 

Natalia Partyka of Poland celebrates winning her Women's Singles C10 classification table tennis final against Yang Qian of China at the London 2012 Paralympic Games September 3, 2012. Partyka, the world number one who was a gold medallist both in the 2008 Beijing Olympics and the 2004 Athens Olympics, is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS) 

Yang Qian of China serves to Natalia Partyka of Poland in their Women's Singles C10 classification table tennis final at the London 2012 Paralympic Games September 3, 2012. Partyka who won the match is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS) 

Natalia Partyka of Poland serves during her Women's Singles C10 table tennis classification match against Umran Ertis of Turkey at the London 2012 Paralympic Games August 30, 2012. The world number one who was a gold medallist both in the 2008 Beijing Olympics and the 2004 Athens Olympics, is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS) 

Natalia Partyka of Poland serves during her Women's Singles C10 classification table tennis match against Umran Ertis of Turkey at the London 2012 Paralympic Games August 30, 2012. The world number one who was a gold medallist both in the 2008 Beijing Olympics and the 2004 Athens Olympics, is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS) 

Natalia Partyka of Poland serves during her Women's Singles C10 table tennis classification match against Umran Ertis of Turkey at the London 2012 Paralympic Games August 30, 2012. The world number one who was a gold medallist both in the 2008 Beijing Olympics and the 2004 Athens Olympics, is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS) 

Natalia Partyka of Poland serves during her Women's Singles C10 table tennis classification match against Umran Ertis of Turkey at the London 2012 Paralympic Games August 30, 2012. The world number one who was a gold medallist both in the 2008 Beijing Olympics and the 2004 Athens Olympics, is also the only female athlete to be competing in both the London 2012 Olympic and Paralympic Games. REUTERS/Toby Melville (BRITAIN - Tags: SPORT OLYMPICS TABLE TENNIS) 

Singapore's Wang Yuegu and Li Jiawei (rear) play against Poland's Katarzyna Grzybowska and Natalia Partyka in their women's team first round table tennis match at the ExCel venue during the London 2012 Olympic Games August 3, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: OLYMPICS SPORT TABLE TENNIS)

Singapore's Wang Yuegu and Li Jiawei (R) play against Poland's Katarzyna Grzybowska and Natalia Partyka in their women's team first round table tennis match at the ExCel venue during the London 2012 Olympic Games August 3, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: OLYMPICS SPORT TABLE TENNIS)

Singapore's Wang Yuegu and Li Jiawei (R) play against Poland's Katarzyna Grzybowska and Natalia Partyka in their women's team first round table tennis match at the ExCel venue during the London 2012 Olympic Games August 3, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: OLYMPICS SPORT TABLE TENNIS)

Singapore's Wang Yuegu and Li Jiawei (rear) play against Poland's Katarzyna Grzybowska and Natalia Partyka in their women's team first round table tennis match at the ExCel venue during the London 2012 Olympic Games August 3, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: OLYMPICS SPORT TABLE TENNIS)

Li Jie of the Netherlands serves to Poland's Natalia Partyka in their women's singles third round table tennis match in the ExCel venue during the London 2012 Olympic Games July 29, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Li Jie of the Netherlands serves to Poland's Natalia Partyka in their women's singles third round table tennis match in the ExCel venue during the London 2012 Olympic Games July 29, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Poland's Natalia Partyka serves to Li Jie of the Netherlands in their women's singles third round table tennis match in the ExCel venue during the London 2012 Olympic Games July 29, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Poland's Natalia Partyka serves to Li Jie of the Netherlands in their women's singles third round table tennis match in the ExCel venue during the London 2012 Olympic Games July 29, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Poland's Natalia Partyka celebrates after defeating Denmark's Mie Skov during their women's singles second round table tennis match in the ExCel venue at the London 2012 Olympic Games July 28, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Poland's Natalia Partyka gestures during her women's singles second round table tennis match against Denmark's Mie Skov in the ExCel venue at the London 2012 Olympic Games July 28, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Denmark's Mie Skov serves to Poland's Natalia Partyka during their women's singles second round table tennis match in the ExCel venue at the London 2012 Olympic Games July 28, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Poland's Natalia Partyka hits a return to Denmark's Mie Skov during their women's singles second round table tennis match in the ExCel venue at the London 2012 Olympic Games July 28, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS) 

Poland's Natalia Partyka prepares to serve to Denmark's Mie Skov during their women's singles second round table tennis match in the ExCel venue at the London 2012 Olympic Games July 28, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Poland's Natalia Partyka serves to Denmark's Mie Skov during their women's singles second round table tennis match in the ExCel venue at the London 2012 Olympic Games July 28, 2012. REUTERS/Grigory Dukor (BRITAIN - Tags: SPORT OLYMPICS SPORT TABLE TENNIS)

Poland's Natalia Partyka plays a ball against Japan's Kasumi Ishikawa during the World Team Table Tennis Championships in Dortmund March 26, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT TABLE TENNIS) 

Poland's Natalia Partyka serves a ball against Japan's Kasumi Ishikawa during the World Team Table Tennis Championships in Dortmund March 26, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT TABLE TENNIS) 

Poland's Natalia Partyka serves a ball against Japan's Kasumi Ishikawa during the World Team Table Tennis Championships in Dortmund March 26, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT TABLE TENNIS) 

Poland's Natalia Partyka serves a ball against Japan's Kasumi Ishikawa during the World Team Table Tennis Championships in Dortmund March 26, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT TABLE TENNIS) 

Japan's Kasumi Ishikawa reacts during her match against Poland's Natalia Partyka at the World Team Table Tennis Championships in Dortmund March 26, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT TABLE TENNIS) 

Japan's Kasumi Ishikawa plays a ball against Poland's Natalia Partyka during the World Team Table Tennis Championships in Dortmund March 26, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT TABLE TENNIS) 

Japan's Kasumi Ishikawa plays a ball against Poland's Natalia Partyka during the World Team Table Tennis Championships in Dortmund March 26, 2012. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT TABLE TENNIS) 

Poland's Partyka Natalia returns the ball to Hong Kong's Tie Yana during their singles match at the Women's World Cup table tennis tournament in Kuala Lumpur September 25, 2010. REUTERS/Samsul Said (MALAYSIA - Tags: SPORT TABLE TENNIS) 

Poland's Partyka Natalia serves the ball to Poland's Hong Kong's Tie Yana during their singles match at the Women's World Cup table tennis tournament in Kuala Lumpur September 25, 2010. REUTERS/Samsul Said (MALAYSIA - Tags: SPORT TABLE TENNIS) 

Hong Kong's Tie Yana returns the ball to Poland's Partyka Natalia during their singles semi-final match at the Women's World Cup table tennis tournament in Kuala Lumpur September 25, 2010. REUTERS/Samsul Said (MALAYSIA - Tags: SPORT TABLE TENNIS) 

Hong Kong's Tie Yana returns the ball to Poland's Partyka Natalia during their singles semi-final match at the Women's World Cup table tennis tournament in Kuala Lumpur September 25, 2010. REUTERS/Samsul Said (MALAYSIA - Tags: SPORT TABLE TENNIS) 

China's Guo Yue returns the ball against Poland's Partyka Natalia during the singles match at the Women's World Cup table tennis tournament in Kuala Lumpur September 24, 2010. REUTERS/Samsul Said(MALAYSIA - Tags: SPORT TABLE TENNIS) 

China's Guo Yue returns the ball against Poland's Partyka Natalia during the singles match at the Women's World Cup table tennis tournament in Kuala Lumpur September 24, 2010. REUTERS/Samsul Said (MALAYSIA - Tags: SPORT TABLE TENNIS) 

China's Guo Yue returns the ball against Poland's Partyka Natalia during their singles match at the Women's World Cup table tennis tournament in Kuala Lumpur September 24, 2010. REUTERS/Samsul Said (MALAYSIA - Tags: SPORT TABLE TENNIS) 

Poland's Partyka Natalia returns the ball against China's Guo Yue during their singles match at the Women's World Cup table tennis tournament in Kuala Lumpur September 24, 2010. REUTERS/Samsul Said(MALAYSIA - Tags: SPORT TABLE TENNIS) 

Natalia Partyka of Poland serves against Kristin Silbereisen of Germany during the first round of their women's singles match at the 2010 European Table Tennis Championships in Ostrava, Czech Republic, September 16, 2010. REUTERS/Petr Josek (CZECH REPUBLIC - Tags: SPORT TABLE TENNIS) 

Natalia Partyka of Poland hits a return to Kristin Silbereisen of Germany during the women's first round match at the 2010 European Table Tennis Championships in Ostrava, Czech Republic, September 16, 2010. REUTERS/Petr Josek (CZECH REPUBLIC - Tags: SPORT TABLE TENNIS) 

Natalia Partyka of Poland hits a return to Kristin Silbereisen (top) of Germany during their women's first round match at the 2010 European Table Tennis Championships in Ostrava, Czech Republic, September 16, 2010. REUTERS/Petr Josek (CZECH REPUBLIC - - Tags: SPORT TABLE TENNIS) 

China's Ding Ning serves to Poland's Natalia Partyka during their Group A First Division match at the 2010 World Table Tennis Championships in Moscow, May 25, 2010. REUTERS/Mikhail Voskresensky (RUSSIA - Tags: SPORT TABLE TENNIS) 

Poland's Natalia Partyka serves against China's Ding Ning during their Group A First Division match at the 2010 World Table Tennis Championships in Moscow, May 25, 2010. REUTERS/Mikhail Voskresensky (RUSSIA - Tags: SPORT TABLE TENNIS) 

Poland's Natalia Partyka serves against China's Ding Ning during their Group A First Division match at the 2010 World Table Tennis Championships in Moscow, May 25, 2010. REUTERS/Mikhail Voskresensky (RUSSIA - Tags: SPORT TABLE TENNIS) 

Poland's Natalia Partyka (L) and Jie Xu return the ball against Singapore's Feng Tianwei and Wang Yue Gu at the women's doubles match during the World Table Tennis Championships in Yokohama, south of Tokyo May 2, 2009. REUTERS/Toru Hanai (JAPAN SPORT TABLE TENNIS) 

Singapore's Wang Yue Gu (front) and Feng Tianwei return the ball against Poland's Natalia Partyka and Jie Xu in the women's doubles match during the World Table Tennis Championships in Yokohama, south of Tokyo May 2, 2009. REUTERS/Toru Hanai (JAPAN SPORT TABLE TENNIS) 

Poland's Natalia Partyka eyes the ball against Hong Kong's Tie Yana (not in the picture) in the women's singles match during the World Table Tennis Championships in Yokohama, south of Tokyo April 30, 2009. REUTERS/Toru Hanai (JAPAN SPORT TABLE TENNIS) 

Poland's Natalia Partyka eyes the ball against Hong Kong's Tie Yana in the women's singles match during the World Table Tennis Championships in Yokohama, south of Tokyo April 30, 2009. REUTERS/Toru Hanai (JAPAN SPORT TABLE TENNIS IMAGES OF THE DAY) 

Hong Kong's Tie Yana eyes the ball against Poland's Natalia Partyka (not in the picture) in the women's singles match during the World Table Tennis Championships in Yokohama, south of Tokyo April 30, 2009. REUTERS/Toru Hanai (JAPAN SPORT TABLE TENNIS) 

Daniela Dodean of Romania eyes the ball during her women's team group C singles table tennis match against Natalia Partyka of Poland at the Beijing 2008 Olympic Games August 14, 2008. REUTERS/Ceerwan Aziz (CHINA)

Natalia Partyka of Poland plays against Daniela Dodean of Romania in their women's team group C singles table tennis match at the Beijing 2008 Olympic Games August 14, 2008. REUTERS/Ceerwan Aziz (CHINA) 

Natalia Partyka of Poland (R) plays against Daniela Dodean of Romania in their women's team group C singles table tennis match at the Beijing 2008 Olympic Games August 14, 2008. REUTERS/Ceerwan Aziz (CHINA)