![New York, NY - September 1, 2019: Roger Federer (Switzerland) in action during round 4 of US Open Championship against David Goffin (Belgium) at Billie Jean King National Tennis Center Stock Photo - Alamy New York, NY - September 1, 2019: Roger Federer (Switzerland) in action during round 4 of US Open Championship against David Goffin (Belgium) at Billie Jean King National Tennis Center Stock Photo - Alamy](https://c8.alamy.com/comp/WGNM5N/new-york-ny-september-1-2019-roger-federer-switzerland-in-action-during-round-4-of-us-open-championship-against-david-goffin-belgium-at-billie-jean-king-national-tennis-center-WGNM5N.jpg)
New York, NY - September 1, 2019: Roger Federer (Switzerland) in action during round 4 of US Open Championship against David Goffin (Belgium) at Billie Jean King National Tennis Center Stock Photo - Alamy
![Juan Martin Del Potro of Argentina returns the ball to Roger Federer, first seed, of Switzerland during the finals match at the US Open Tennis Championship on September 14, 2009 in New Juan Martin Del Potro of Argentina returns the ball to Roger Federer, first seed, of Switzerland during the finals match at the US Open Tennis Championship on September 14, 2009 in New](https://c8.alamy.com/comp/TYKD8R/juan-martin-del-potro-of-argentina-returns-the-ball-to-roger-federer-first-seed-of-switzerland-during-the-finals-match-at-the-us-open-tennis-championship-on-september-14-2009-in-new-york-upi-monika-graff-TYKD8R.jpg)
Juan Martin Del Potro of Argentina returns the ball to Roger Federer, first seed, of Switzerland during the finals match at the US Open Tennis Championship on September 14, 2009 in New
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Jil Teichmann Switzerland returns shot Aliona Bolsova Editorial Stock Photo - Stock Image | Shutterstock
![US Open 2017 Mixed Doubles Champion Martina Hingis of Switzerland in Action during Final Match Editorial Photography - Image of hingis, center: 100990942 US Open 2017 Mixed Doubles Champion Martina Hingis of Switzerland in Action during Final Match Editorial Photography - Image of hingis, center: 100990942](https://thumbs.dreamstime.com/b/new-york-september-us-open-mixed-doubles-champion-martina-hingis-switzerland-action-final-match-billie-jean-king-100990942.jpg)
US Open 2017 Mixed Doubles Champion Martina Hingis of Switzerland in Action during Final Match Editorial Photography - Image of hingis, center: 100990942
![New York, United States. 04th Sep, 2019. Donna Vekic (Croatia) in action during quarter final of US Open Championships against Belinda Bencic ( Switzerland) at Billie Jean King National Tennis Center (Photo by New York, United States. 04th Sep, 2019. Donna Vekic (Croatia) in action during quarter final of US Open Championships against Belinda Bencic ( Switzerland) at Billie Jean King National Tennis Center (Photo by](https://c8.alamy.com/comp/WM3D2P/new-york-united-states-04th-sep-2019-donna-vekic-croatia-in-action-during-quarter-final-of-us-open-championships-against-belinda-bencic-switzerland-at-billie-jean-king-national-tennis-center-photo-by-lev-radinpacific-press-credit-pacific-press-agencyalamy-live-news-WM3D2P.jpg)
New York, United States. 04th Sep, 2019. Donna Vekic (Croatia) in action during quarter final of US Open Championships against Belinda Bencic ( Switzerland) at Billie Jean King National Tennis Center (Photo by
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