Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 Czech Republic's Lucie Safarova in action during the third round match against Russia's Ekaterina Makarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 Czech Republic's Lucie Safarova in action during the third round match against Russia's Ekaterina Makarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 Czech Republic's Lucie Safarova in action during the third round match against Russia's Ekaterina Makarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 A spectator in the stands watching Russia's Ekaterina Makarova in action during the third round match against Czech Republic's Lucie Safarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 Russia's Ekaterina Makarova in action during the third round match against Czech Republic's Lucie Safarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 Russia's Ekaterina Makarova in action during the third round match against Czech Republic's Lucie Safarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 Czech Republic's Lucie Safarova in action during the third round match against Russia's Ekaterina Makarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2018 Czech Republic's Lucie Safarova in action during the third round match against Russia's Ekaterina Makarova REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018 Czech Republic's Lucie Safarova in action during the second round match against Poland's Agnieszka Radwanska REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018 Czech Republic's Lucie Safarova in action during the second round match against Poland's Agnieszka Radwanska REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Poland's Agnieszka Radwanska reacts during her second round match against Czech Republic's Lucie Safarova. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Czech Republic's Lucie Safarova reacts during her second round match against Poland's Agnieszka Radwanska. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Czech Republic's Lucie Safarova reacts during her second round match against Poland's Agnieszka Radwanska. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Poland's Agnieszka Radwanska reacts during her second round match against Czech Republic's Lucie Safarova. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Czech Republic's Lucie Safarova plays a shot during her second round match against Poland's Agnieszka Radwanska. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Czech Republic's Lucie Safarova plays a shot during her second round match against Poland's Agnieszka Radwanska. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Czech Republic's Lucie Safarova plays a shot during her second round match against Poland's Agnieszka Radwanska. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Czech Republic's Lucie Safarova plays a shot during her second round match against Poland's Agnieszka Radwanska. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Czech Republic's Lucie Safarova hits a shot during her second round match against Poland's Agnieszka Radwanska. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Poland's Agnieszka Radwanska plays a shot during her second round match against Czech Republic's Lucie Safarova. REUTERS/Andrew Boyers 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 4, 2018. Poland's Agnieszka Radwanska plays a shot during her second round match against Czech Republic's Lucie Safarova. REUTERS/Andrew Boyers 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova in action during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova celebrates during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova in action during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova celebrates after winning her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova celebrates after winning her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova in action during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova in action during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova in action during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova celebrates during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Karolina Pliskova in action during her second round match against Czech Republic's Lucie Safarova REUTERS/Benoit Tessier 

Tennis - French Open - Roland Garros, Paris, France - May 31, 2018 Czech Republic's Lucie Safarova in action during her second round match against Czech Republic's Karolina Pliskova REUTERS/Benoit Tessier 

Tennis - Fed Cup World Group First Round - Czech Republic vs Switzerland - O2 Arena, Prague, Czech Republic - February 11, 2018 Czech Republic's Petra Kvitova celebrates with captain Petr Pala and Lucie Safarova after winning her singles match against Switzerland's Belinda Bencic REUTERS/Milan Kammermayer 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic signs autographs after winning against Lucie Safarova of Czech Republic. REUTERS/Issei Kato TPX IMAGES OF THE DAY 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic signs autographs after winning against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Lucie Safarova of Czech Republic waves as she leaves after losing against Karolina Pliskova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic shakes hands with Lucie Safarova of Czech Republic after Pliskova won their match. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic celebrates winning against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic celebrates winning against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic celebrates winning against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic hits a shot against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic hits a shot against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic reacts during her match against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic reacts during her match against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic rests on her racquet during her match against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Lucie Safarova of Czech Republic hits a shot against Karolina Pliskova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic hits a shot against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic hits a shot against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Lucie Safarova of Czech Republic hits a shot against Karolina Pliskova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic prepares to serve against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Lucie Safarova of Czech Republic hits a shot against Karolina Pliskova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic hits a shot against Lucie Safarova of Czech Republic. REUTERS/Issei Kato 

Tennis - Australian Open - Margaret Court Arena, Melbourne, Australia, January 20, 2018. Karolina Pliskova of Czech Republic and Lucie Safarova of Czech Republic pose for a picture before their match. REUTERS/Issei Kato