US Open 2016

photo: Wojciech Kubik/East News 06.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. Trening Novaka Djokovicia. n/z: Novak Djokovic

photo: Wojciech Kubik/East News 06.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. Trening Novaka Djokovicia. n/z: Nowak Djokovic

photo: Wojciech Kubik/East News 06.09.2016. Nowy Jork. Turniej tenisowy US Open 2016.Trening Novaka Djokovicia. n/z: Novak Djokovic

Mandatory Credit: Photo by Juergen Hasenkopf/REX/Shutterstock (5892944b) Angelique Kerber (Ger) US Open Tennis Championships, Day 9, Flushing Meadow...

Mandatory Credit: Photo by Jo Becktold/CSM/REX/Shutterstock (5892829ao) Caroline Wozniacki (DEN) defeated Anastasija Sevastova (LAT) 6-0, 6-2, at the...

Mandatory Credit: Photo by Jo Becktold/CSM/REX/Shutterstock (5892829aq) Caroline Wozniacki (DEN) defeated Anastasija Sevastova (LAT) 6-0, 6-2, at the...

Andy Murray, of Britain, celebrates after defeating Grigor Dimitrov, of Bulgaria, 6-1, 6-2, 6-2 at the U.S. Open tennis tournament, Monday, Sept. 5, 2...

Agnieszka Radwanska, of Poland, hits a backhand to Ana Konjuh, of Croatia, during the fourth round of the U.S. Open tennis tournament, Monday, Sept. 5...

Agnieszka Radwanska, of Poland, hits a forehand to Ana Konjuh, of Croatia, at the U.S. Open tennis tournament, Monday, Sept. 5, 2016, in New York. (AP...

Agnieszka Radwanska, of Poland, serves to Ana Konjuh, of Croatia, at the U.S. Open tennis tournament, Monday, Sept. 5, 2016, in New York. (AP Photo/Da...

Agnieszka Radwanska, of Poland, serves to Ana Konjuh, of Coatia, during the fourth round of the U.S. Open tennis tournament Monday, Sept. 5, 2016, in...

Agnieszka Radwanska, of Poland, hits a backhand to Ana Konjuh, of Coatia, during the U.S. Open tennis tournament, Monday, Sept. 5, 2016, in New York....

Agnieszka Radwanska, of Poland, serves to Ana Konjuh, of Coatia, during the U.S. Open tennis tournament, Monday, Sept. 5, 2016, in New York. (AP Photo...

Agnieszka Radwanska, of Poland, reacts after missing a shot against Ana Konjuh, of Croatia, during the U.S. Open tennis tournament, Monday, Sept. 5, 2...

Agnieszka Radwanska, of Poland, reacts after losing a point to Ana Konjuh, of Coatia, at the U.S. Open tennis tournament, Monday, Sept. 5, 2016, in Ne...

Agnieszka Radwanska, of Poland, hits a return shot to Ana Konjuh, of Croatia, during the U.S. Open tennis tournament, Monday, Sept. 5, 2016, in New Yo...

Agnieszka Radwanska, of Poland, reacts after losing a point to Ana Konjuh, of Croatia, at the U.S. Open tennis tournament, Monday, Sept. 5, 2016, in N...

Ana Konjuh, of Croatia, reacts to winning a point against Agnieszka Radwanska, of Poland, at the U.S. Open tennis tournament, Monday, Sept. 5, 2016, i...

Agnieszka Radwanska, of Poland, walks off the court after losing 6-4, 6-4 to Ana Konjuh, of Croatia, at the U.S. Open tennis tournament, Monday, Sept...

Angelique Kerber, of Germany, can't make a shot against Roberta Vinci, of Italy, during the quarterfinals of the U.S. Open tennis tournament, Tuesday,...

Roberta Vinci, of Italy, can't catch up with a lob shot from Angelique Kerber, of Germany, during the quarterfinals of the U.S. Open tennis tournament...

Lucas Pouille, of France, returns a shot to Gael Monfils, of France, during the quarterfinals of the U.S. Open tennis tournament, Tuesday, Sept. 6, 20...

Gael Monfils, of France, chases down a shot from Lucas Pouille, of France, during the quarterfinals of the U.S. Open tennis tournament, Tuesday, Sept....

Gael Monfils, of France, returns a shot to Lucas Pouille, of France, during the quarterfinals of the U.S. Open tennis tournament, Tuesday, Sept. 6, 20...

Serena Williams of United States plays her 2016 US Open fourth round Women's Singles match at the USTA Billie Jean King National Tennis Center in New...

Serena Williams of USA arrives at practice with her coach Patrick Mouratoglou at the 2016 US Open at Billie Jean National Tennis Center in New City, N...

FLUSHING NY- SEPTEMBER 06: Angelique Kerber Vs RobertaVinci on Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 6,...

FLUSHING NY- SEPTEMBER 06: Angelique Kerber Vs RobertaVinci on Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 6,...

FLUSHING NY- SEPTEMBER 06: Angelique Kerber Vs RobertaVinci on Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 6,...

FLUSHING NY- SEPTEMBER 06: Angelique Kerber Vs RobertaVinci on Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 6,...

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Ana Konjuh (CRO)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Daria Kuczer (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Daria Kuczer (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Daria Kuczer (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Daria Kuczer (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Daria Kuczer (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Daria Kuczer (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Daria Kuczer (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Wiktoria Kulik (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Ana Konjuh (CRO)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Agnieszka Radwanska (POL)

photo: Wojciech Kubik/East News 05.09.2016. Nowy Jork. Turniej tenisowy US Open 2016. n/z: Agnieszka Radwanska (POL), Ana Konjuh (CRO)