![Switzerland Roger Federer serves to Germany's Nicolas Kiefer in their quarterfinal match at the Swiss Indoors ATP tennis tournament in Basel, October 26, 2007. REUTERS/Vincent Kessler (SWITZERLAND Stock Photo - Alamy Switzerland Roger Federer serves to Germany's Nicolas Kiefer in their quarterfinal match at the Swiss Indoors ATP tennis tournament in Basel, October 26, 2007. REUTERS/Vincent Kessler (SWITZERLAND Stock Photo - Alamy](https://c8.alamy.com/comp/2E83NW1/switzerland-roger-federer-serves-to-germanys-nicolas-kiefer-in-their-quarterfinal-match-at-the-swiss-indoors-atp-tennis-tournament-in-basel-october-26-2007-reutersvincent-kessler-switzerland-2E83NW1.jpg)
Switzerland Roger Federer serves to Germany's Nicolas Kiefer in their quarterfinal match at the Swiss Indoors ATP tennis tournament in Basel, October 26, 2007. REUTERS/Vincent Kessler (SWITZERLAND Stock Photo - Alamy
![Viktorija Golubic Switzerland action during her round Editorial Stock Photo - Stock Image | Shutterstock Viktorija Golubic Switzerland action during her round Editorial Stock Photo - Stock Image | Shutterstock](https://editorial01.shutterstock.com/wm-preview-1500/9763372ap/d234be67/wta-womens-tennis-tournament-in-gstaad-switzerland-shutterstock-editorial-9763372ap.jpg)
Viktorija Golubic Switzerland action during her round Editorial Stock Photo - Stock Image | Shutterstock
![Alize Cornet France celebrates winning quarter final Editorial Stock Photo - Stock Image | Shutterstock Alize Cornet France celebrates winning quarter final Editorial Stock Photo - Stock Image | Shutterstock](https://editorial01.shutterstock.com/wm-preview-1500/9766382af/570ac27a/wta-ladies-championship-tennis-tournament-in-gstaad-switzerland-shutterstock-editorial-9766382af.jpg)
Alize Cornet France celebrates winning quarter final Editorial Stock Photo - Stock Image | Shutterstock
Viktorija Golubic of Switzerland serves in her match against Simona... Nachrichtenfoto - Getty Images
![Switzerland's Roger Federer serves to Agentina's Juan Martin Del Potro during their second round match at Switzerland's Roger Federer serves to Agentina's Juan Martin Del Potro during their second round match at](https://c8.alamy.com/comp/2E78MW7/switzerlands-roger-federer-serves-to-agentinas-juan-martin-del-potro-during-their-second-round-match-at-the-swiss-indoors-atp-tennis-tournament-in-basel-october-25-2007-federer-won-6-1-6-4-reutersvincent-kessler-switzerland-2E78MW7.jpg)
Switzerland's Roger Federer serves to Agentina's Juan Martin Del Potro during their second round match at
![Alize Cornet France celebrates after winning final Editorial Stock Photo - Stock Image | Shutterstock Alize Cornet France celebrates after winning final Editorial Stock Photo - Stock Image | Shutterstock](https://editorial01.shutterstock.com/wm-preview-1500/9767519k/d5dfebd7/wta-ladies-championship-tennis-tournament-in-gstaad-switzerland-shutterstock-editorial-9767519k.jpg)