Nobody knows Roger Federer's conditions," all doubts from Basel director
Tennis: Federer wins easily at Basel in 1,500th tour singles match - The Mainichi
Story Of Basel 2017 - YouTube
Tennis - ATP 500 - Basel Open - St. Jakobshalle, Basel, Switzerland - October 28, 2018 Switzerland's Roger Federer in action during the singles final against Romania's Marius Copil REUTERS/Arnd Wiegmann Stock Photo - Alamy