Serena Williams of the United States plays against Elina Svitolina of Ukraine in the semifinals of the U.S. Open tennis tournament in New York on Sept. 5, 2019. (Kyodo via AP Images) ==Kyodo

Elina Svitolina of Ukraine plays against Serena Williams of the United States in the semifinals of the U.S. Open tennis tournament in New York on Sept. 5, 2019. (Kyodo via AP Images) ==Kyodo

Serena Williams of the United States reacts after her semifinal win over Elina Svitolina of Ukraine at the U.S. Open tennis tournament in New York on Sept. 5, 2019. (Kyodo via AP Images) ==Kyodo

Serena Williams of the United States plays against Elina Svitolina of Ukraine in the semifinals of the U.S. Open tennis tournament in New York on Sept. 5, 2019. (Kyodo via AP Images) ==Kyodo

Serena Williams of the United States plays against Elina Svitolina of Ukraine in the semifinals of the U.S. Open tennis tournament in New York on Sept. 5, 2019. (Kyodo via AP Images) ==Kyodo

Serena Williams of the United States plays against Elina Svitolina of Ukraine in the semifinals of the U.S. Open tennis tournament in New York on Sept. 5, 2019. (Kyodo via AP Images) ==Kyodo

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA celebrates winning against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA celebrates winning against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams (R) of USA greets Elina Svitolina (L) of Ukraine after winning US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA and Elina Svitolina of Ukraine pose for a photo before US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Elina Svitolina of Ukraine in action against Serena Williams of USA during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Elina Svitolina of Ukraine in action against Serena Williams of USA during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Elina Svitolina of Ukraine in action against Serena Williams of USA during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Elina Svitolina of Ukraine in action against Serena Williams of USA during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

NEW YORK, USA - SEPTEMBER 05: Serena Williams of USA in action against Elina Svitolina of Ukraine during US Open Championships semi final match at Billie Jean King National Tennis Center in New York, United States on September 05, 2019. Lev Radin / Anadolu Agency/ABACAPRESS.COM

Tennis - US Open 2019 - Serena Williams - Usa - Svitolina - Ukraine TENNIS : US Open 2019 - USA - 05/09/2019 ChrysleneCaillaud/Panoramic PUBLICATIONxNOTxINxFRAxITAxBEL

Tennis - US Open 2019 - Svitolina - Ukraine TENNIS : US Open 2019 - USA - 05/09/2019 ChrysleneCaillaud/Panoramic PUBLICATIONxNOTxINxFRAxITAxBEL

US OPEN 2019 Elina Svitolina , Ukraine *** US OPEN 2019 Elina Svitolina , Ukraine