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St Jakobshalle, Basel, Switzerland. 23rd Oct, 2018. ATP World Tour, Swiss Indoor Tennis; Roger Federer (SUI) in action against Filip Krajinovic (SRB) in the first round Credit: Action Plus Sports/Alamy Live News
24th October 2019; St. Jakobshalle, Basel, Switzerland; ATP World Tour Tennis, Swiss Indoors; Stan Wawrinka (SUI) hits a volley in the match against Francis Tiafoe (USA) - Editorial Use Stock Photo - Alamy
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/origin-imgresizer.eurosport.com/2018/02/16/2272563-47350050-2560-1440.jpg "Federer becomes oldest ATP world number one - Eurosport")
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St. Jakobshalle, Basel, Switzerland. 20th Oct, 2019. ATP World Tour Tennis, Swiss Indoors; Soonwoo Kwon (KOR) at the net in the match against Alexei Popyrin (AUS) - Editorial Use Credit: Action Plus
St Jakobshalle, Basel, Switzerland. 26th Oct, 2018. ATP World Tour, Swiss Indoor Tennis; Roger Federer (SUI)
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St. Jakobshalle, Basel, Switzerland. 20th Oct, 2019. ATP World Tour Tennis, Swiss Indoors; Soonwoo Kwon (KOR) plays a forehand in the match between Alexei Popyrin (AUS) and Soonwoo Kwon (KOR) - Editorial
