![Switzerland's Roger Federer hits a forehand to Spain's David Ferrer during their quarterfinals at the Swiss Indoors tennis tournament in Basel October 27, 2006. REUTERS/Siggi Bucher (SWITZERLAND Stock Photo - Alamy Switzerland's Roger Federer hits a forehand to Spain's David Ferrer during their quarterfinals at the Swiss Indoors tennis tournament in Basel October 27, 2006. REUTERS/Siggi Bucher (SWITZERLAND Stock Photo - Alamy](https://c8.alamy.com/comp/2E6PMH2/switzerlands-roger-federer-hits-a-forehand-to-spains-david-ferrer-during-their-quarterfinals-at-the-swiss-indoors-tennis-tournament-in-basel-october-27-2006-reuterssiggi-bucher-switzerland-2E6PMH2.jpg)
Switzerland's Roger Federer hits a forehand to Spain's David Ferrer during their quarterfinals at the Swiss Indoors tennis tournament in Basel October 27, 2006. REUTERS/Siggi Bucher (SWITZERLAND Stock Photo - Alamy
![Switzerland's Roger Federer serves during his match against Belgium's Olivier Rochus at the Swiss Indoors ATP tennis tournament in Basel November 2, 2009. REUTERS/Christian Hartmann (SWITZERLAND SPORT TENNIS Stock Photo - Alamy Switzerland's Roger Federer serves during his match against Belgium's Olivier Rochus at the Swiss Indoors ATP tennis tournament in Basel November 2, 2009. REUTERS/Christian Hartmann (SWITZERLAND SPORT TENNIS Stock Photo - Alamy](https://c8.alamy.com/comp/2E782GR/switzerlands-roger-federer-serves-during-his-match-against-belgiums-olivier-rochus-at-the-swiss-indoors-atp-tennis-tournament-in-basel-november-2-2009-reuterschristian-hartmann-switzerland-sport-tennis-2E782GR.jpg)
Switzerland's Roger Federer serves during his match against Belgium's Olivier Rochus at the Swiss Indoors ATP tennis tournament in Basel November 2, 2009. REUTERS/Christian Hartmann (SWITZERLAND SPORT TENNIS Stock Photo - Alamy
![Roger Federer opens up on hopes of Stan Wawrinka battle at Swiss Indoors Basel | Tennis | Sport | Express.co.uk Roger Federer opens up on hopes of Stan Wawrinka battle at Swiss Indoors Basel | Tennis | Sport | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/72/590x/Roger-Federer-1194796.jpg?r=1571873982590)