![Germany's Tommy Haas returns the ball during his semifinal tennis match against Switzerland's Roger Federer at the ATP Gerry Weber Open tornament in Halle, Westphalia, Germany, Saturday, June 15, 2013. (AP Photo/Martin Germany's Tommy Haas returns the ball during his semifinal tennis match against Switzerland's Roger Federer at the ATP Gerry Weber Open tornament in Halle, Westphalia, Germany, Saturday, June 15, 2013. (AP Photo/Martin](https://c8.alamy.com/comp/2N7A4BF/germanys-tommy-haas-returns-the-ball-during-his-semifinal-tennis-match-against-switzerlands-roger-federer-at-the-atp-gerry-weber-open-tornament-in-halle-westphalia-germany-saturday-june-15-2013-ap-photomartin-meissner-2N7A4BF.jpg)
Germany's Tommy Haas returns the ball during his semifinal tennis match against Switzerland's Roger Federer at the ATP Gerry Weber Open tornament in Halle, Westphalia, Germany, Saturday, June 15, 2013. (AP Photo/Martin
![Halle, Germany. 20th June, 2015. Roger Federer of Switzerland during the semifinal match against Ivo Karlovic of Croatia in the ATP tennis tournament in Halle, Germany, 20 June 2015. Photo: MAJA HITIJ/dpa/Alamy Halle, Germany. 20th June, 2015. Roger Federer of Switzerland during the semifinal match against Ivo Karlovic of Croatia in the ATP tennis tournament in Halle, Germany, 20 June 2015. Photo: MAJA HITIJ/dpa/Alamy](https://c8.alamy.com/comp/EW8T0N/halle-germany-20th-june-2015-roger-federer-of-switzerland-during-the-EW8T0N.jpg)
Halle, Germany. 20th June, 2015. Roger Federer of Switzerland during the semifinal match against Ivo Karlovic of Croatia in the ATP tennis tournament in Halle, Germany, 20 June 2015. Photo: MAJA HITIJ/dpa/Alamy
![Halle (Westfalen), Germany. 20th June, 2015. Roger Federer cheers during a match of the Gerry Weber Open semi-finals against Ivo Karlovic in Halle (Westfalen). Credit: Miroslav Dakov/Alamy Live News Stock Photo - Halle (Westfalen), Germany. 20th June, 2015. Roger Federer cheers during a match of the Gerry Weber Open semi-finals against Ivo Karlovic in Halle (Westfalen). Credit: Miroslav Dakov/Alamy Live News Stock Photo -](https://c8.alamy.com/comp/EW8RHR/halle-westfalen-germany-20th-june-2015-roger-federer-cheers-during-EW8RHR.jpg)
Halle (Westfalen), Germany. 20th June, 2015. Roger Federer cheers during a match of the Gerry Weber Open semi-finals against Ivo Karlovic in Halle (Westfalen). Credit: Miroslav Dakov/Alamy Live News Stock Photo -
![Halle, Germany. 17th June, 2015. Ivo Karlovic of Croatia in action during the round of 16 match against Alexander Zverev of Germany at the ATP tennis tournament in Halle, Germany, 17 June Halle, Germany. 17th June, 2015. Ivo Karlovic of Croatia in action during the round of 16 match against Alexander Zverev of Germany at the ATP tennis tournament in Halle, Germany, 17 June](https://c8.alamy.com/comp/EW3WBR/halle-germany-17th-june-2015-ivo-karlovic-of-croatia-in-action-during-EW3WBR.jpg)
Halle, Germany. 17th June, 2015. Ivo Karlovic of Croatia in action during the round of 16 match against Alexander Zverev of Germany at the ATP tennis tournament in Halle, Germany, 17 June
TENNIS on X: "Eight-time Halle champion Roger Federer continues his grass season campaign tomorrow vs. Rendy Lu. Week in Preview: https://t.co/2RE0tiAjEq https://t.co/zEk4BU9mvR" / X
![Halle, Germany. 20th June, 2015. Roger Federer of Switzerland during the semifinal match against Ivo Karlovic of Croatia in the ATP tennis tournament in Halle, Germany, 20 June 2015. Photo: MAJA HITIJ/dpa/Alamy Halle, Germany. 20th June, 2015. Roger Federer of Switzerland during the semifinal match against Ivo Karlovic of Croatia in the ATP tennis tournament in Halle, Germany, 20 June 2015. Photo: MAJA HITIJ/dpa/Alamy](https://l450v.alamy.com/450v/ew8rcg/halle-westfalen-germany-20th-june-2015-roger-federer-during-a-match-ew8rcg.jpg)
Halle, Germany. 20th June, 2015. Roger Federer of Switzerland during the semifinal match against Ivo Karlovic of Croatia in the ATP tennis tournament in Halle, Germany, 20 June 2015. Photo: MAJA HITIJ/dpa/Alamy
![Halle (Westfalen), Germany. 20th June, 2015. Roger Federer cheers during a match of the Gerry Weber Open semi-finals against Ivo Karlovic in Halle (Westfalen) on June 20, 2015. Credit: Miroslav Dakov/Alamy Live Halle (Westfalen), Germany. 20th June, 2015. Roger Federer cheers during a match of the Gerry Weber Open semi-finals against Ivo Karlovic in Halle (Westfalen) on June 20, 2015. Credit: Miroslav Dakov/Alamy Live](https://c8.alamy.com/comp/EW8RKC/halle-westfalen-germany-20th-june-2015-roger-federer-cheers-during-EW8RKC.jpg)