![US Open 2019 | US Open 2019: Defending champion Novak Djokovic forced to retire; Stan Wawrinka prevails to reach quarterfinal | Tennis News US Open 2019 | US Open 2019: Defending champion Novak Djokovic forced to retire; Stan Wawrinka prevails to reach quarterfinal | Tennis News](https://imgk.timesnownews.com/story/1567393312-djoko-waw.jpg?tr=w-1200,h-900)
US Open 2019 | US Open 2019: Defending champion Novak Djokovic forced to retire; Stan Wawrinka prevails to reach quarterfinal | Tennis News
![Stan Wawrinka (Switzerland) in action during quarter final of US Open Championships against Daniil Medvedev (Russia) at Billie Jean King National Tennis Center in New York, NY on September 3, 2019. (Photo Stan Wawrinka (Switzerland) in action during quarter final of US Open Championships against Daniil Medvedev (Russia) at Billie Jean King National Tennis Center in New York, NY on September 3, 2019. (Photo](https://c8.alamy.com/comp/2ENM5BM/stan-wawrinka-switzerland-in-action-during-quarter-final-of-us-open-championships-against-daniil-medvedev-russia-at-billie-jean-king-national-tennis-center-in-new-york-ny-on-september-3-2019-photo-by-lev-radinpacific-presssipa-usa-2ENM5BM.jpg)
Stan Wawrinka (Switzerland) in action during quarter final of US Open Championships against Daniil Medvedev (Russia) at Billie Jean King National Tennis Center in New York, NY on September 3, 2019. (Photo
![No. 5 Medvedev wins over Wawrinka, into first Slam semi - Official Site of the 2023 US Open Tennis Championships - A USTA Event No. 5 Medvedev wins over Wawrinka, into first Slam semi - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_USTA1183364_20190903_USO_D9_GE2_7601.jpg)
No. 5 Medvedev wins over Wawrinka, into first Slam semi - Official Site of the 2023 US Open Tennis Championships - A USTA Event
![Key Matches: Daniil Medvedev vs. Stan Wawrinka - Official Site of the 2023 US Open Tennis Championships - A USTA Event Key Matches: Daniil Medvedev vs. Stan Wawrinka - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_USTA1175387_20190830_D5_S.Wawrinka_VS_P.Lorenzo_Armstrong-FernandoColon_13.jpg)
Key Matches: Daniil Medvedev vs. Stan Wawrinka - Official Site of the 2023 US Open Tennis Championships - A USTA Event
![Best photos of Stan Wawrinka and Daniil Medvedev's quarterfinal at the 2019 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event Best photos of Stan Wawrinka and Daniil Medvedev's quarterfinal at the 2019 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_USTA1183300_20190903_USO_D9_GE2_7375.jpg)
Best photos of Stan Wawrinka and Daniil Medvedev's quarterfinal at the 2019 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event
![Best photos of Stan Wawrinka and Daniil Medvedev's quarterfinal at the 2019 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event Best photos of Stan Wawrinka and Daniil Medvedev's quarterfinal at the 2019 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_USTA1183417_20190903_USO_D9_GE3_9197.jpg)
Best photos of Stan Wawrinka and Daniil Medvedev's quarterfinal at the 2019 US Open - Official Site of the 2023 US Open Tennis Championships - A USTA Event
![Daniil Medvedev uses boos to beat Stan Wawrinka and reach semi-finals | US Open Tennis 2019 | The Guardian Daniil Medvedev uses boos to beat Stan Wawrinka and reach semi-finals | US Open Tennis 2019 | The Guardian](https://i.guim.co.uk/img/media/78f054362e15f04dbe1fb786b2f4087e04d93e58/0_135_4987_2993/master/4987.jpg?width=1200&height=900&quality=85&auto=format&fit=crop&s=72b18944f922b30fad32582651f9ad09)
Daniil Medvedev uses boos to beat Stan Wawrinka and reach semi-finals | US Open Tennis 2019 | The Guardian
![2019 US Open quarterfinal preview: Daniil Medvedev vs. Stan Wawrinka - Official Site of the 2023 US Open Tennis Championships - A USTA Event 2019 US Open quarterfinal preview: Daniil Medvedev vs. Stan Wawrinka - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_USTA1180263_20190901_USO_D7_AO2_3459.jpg)