![German tennis player Nicolas Kiefer returns the ball to French player Cedric pioline during his match at the ABN Amro World Tennis Tournament in Rotterdam February 18. FEE Stock Photo - Alamy German tennis player Nicolas Kiefer returns the ball to French player Cedric pioline during his match at the ABN Amro World Tennis Tournament in Rotterdam February 18. FEE Stock Photo - Alamy](https://c8.alamy.com/comp/2D55DKA/german-tennis-player-nicolas-kiefer-returns-the-ball-to-french-player-cedric-pioline-during-his-match-at-the-abn-amro-world-tennis-tournament-in-rotterdam-february-18-fee-2D55DKA.jpg)
German tennis player Nicolas Kiefer returns the ball to French player Cedric pioline during his match at the ABN Amro World Tennis Tournament in Rotterdam February 18. FEE Stock Photo - Alamy
![London United Kingdom German Nicolas Kiefer Pumps Editorial Stock Photo - Stock Image | Shutterstock London United Kingdom German Nicolas Kiefer Pumps Editorial Stock Photo - Stock Image | Shutterstock](https://editorial01.shutterstock.com/wm-preview-1500/7648847a/a8bfa2fe/tennis-wimbledon-kiefer-fist-jul-2001-shutterstock-editorial-7648847a.jpg)
London United Kingdom German Nicolas Kiefer Pumps Editorial Stock Photo - Stock Image | Shutterstock
![Tennis - Nottingham Open 2002 - Second Round. Nicolas Kiefer in action against Arvind Parmar Stock Photo - Alamy Tennis - Nottingham Open 2002 - Second Round. Nicolas Kiefer in action against Arvind Parmar Stock Photo - Alamy](https://c8.alamy.com/comp/GAD48D/tennis-nottingham-open-2002-second-round-nicolas-kiefer-in-action-GAD48D.jpg)
Tennis - Nottingham Open 2002 - Second Round. Nicolas Kiefer in action against Arvind Parmar Stock Photo - Alamy
![Germany's Nicolas Kiefer reacts after winning a point during his reverse singles tennis match against Czech Republic's Tomas Berdych during their Davis Cup World Group Play-off at Tipsport Arena in the town Germany's Nicolas Kiefer reacts after winning a point during his reverse singles tennis match against Czech Republic's Tomas Berdych during their Davis Cup World Group Play-off at Tipsport Arena in the town](https://c8.alamy.com/comp/2E793C4/germanys-nicolas-kiefer-reacts-after-winning-a-point-during-his-reverse-singles-tennis-match-against-czech-republics-tomas-berdych-during-their-davis-cup-world-group-play-off-at-tipsport-arena-in-the-town-of-liberec-100km-62-miles-north-of-prague-september-25-2005-reutersdavid-w-cerny-2E793C4.jpg)
Germany's Nicolas Kiefer reacts after winning a point during his reverse singles tennis match against Czech Republic's Tomas Berdych during their Davis Cup World Group Play-off at Tipsport Arena in the town
![Tennis, Gerry Weber Open Halle Germany 13.6.99, Final match Nicolas Kiefer (GER) vs Nicklas Kulti (SWE) --- Nicolas Kiefer (GER Stock Photo - Alamy Tennis, Gerry Weber Open Halle Germany 13.6.99, Final match Nicolas Kiefer (GER) vs Nicklas Kulti (SWE) --- Nicolas Kiefer (GER Stock Photo - Alamy](https://c8.alamy.com/comp/MK89GC/tennis-gerry-weber-open-halle-germany-13699-final-match-nicolas-kiefer-ger-vs-nicklas-kulti-swe-nicolas-kiefer-ger-MK89GC.jpg)
Tennis, Gerry Weber Open Halle Germany 13.6.99, Final match Nicolas Kiefer (GER) vs Nicklas Kulti (SWE) --- Nicolas Kiefer (GER Stock Photo - Alamy
![Tennis - Australian Open - Melbourne Park - 27/1/06 Nicolas Kiefer (Germany) celebrates winning the second set Mandatory Credit: Action Images / Jason O'Brien Livepic Stock Photo - Alamy Tennis - Australian Open - Melbourne Park - 27/1/06 Nicolas Kiefer (Germany) celebrates winning the second set Mandatory Credit: Action Images / Jason O'Brien Livepic Stock Photo - Alamy](https://c8.alamy.com/comp/2EC253Y/tennis-australian-open-melbourne-park-27106-nicolas-kiefer-germany-celebrates-winning-the-second-set-mandatory-credit-action-images-jason-obrien-livepic-2EC253Y.jpg)
Tennis - Australian Open - Melbourne Park - 27/1/06 Nicolas Kiefer (Germany) celebrates winning the second set Mandatory Credit: Action Images / Jason O'Brien Livepic Stock Photo - Alamy
![German tennis pro Nicolas Kiefer looks frustrated during his match against Belarusian Mirnyi at the ATP German Masters in Hamburg, Germany, Wednesday, 17 May 2006. Kiefer lost the match in two sets German tennis pro Nicolas Kiefer looks frustrated during his match against Belarusian Mirnyi at the ATP German Masters in Hamburg, Germany, Wednesday, 17 May 2006. Kiefer lost the match in two sets](https://c8.alamy.com/comp/D3NHRG/german-tennis-pro-nicolas-kiefer-looks-frustrated-during-his-match-D3NHRG.jpg)
German tennis pro Nicolas Kiefer looks frustrated during his match against Belarusian Mirnyi at the ATP German Masters in Hamburg, Germany, Wednesday, 17 May 2006. Kiefer lost the match in two sets
![Ex-tennis star Nicolas Kiefer assesses entry chaos around Djokovic for Alexander Zverev "positive" and expects victory at the Australian Open - California18 Ex-tennis star Nicolas Kiefer assesses entry chaos around Djokovic for Alexander Zverev "positive" and expects victory at the Australian Open - California18](https://california18.com/wp-content/uploads/2022/01/7854855018579991.jpeg)