![TENNIS on Twitter: "Nicolas Kiefer shares an epic #ThrowbackThursday photo of a very young, long-haired Federer, Haas and more: https://t.co/SmCb7RuuBI https://t.co/35jIpPBxHt" / Twitter TENNIS on Twitter: "Nicolas Kiefer shares an epic #ThrowbackThursday photo of a very young, long-haired Federer, Haas and more: https://t.co/SmCb7RuuBI https://t.co/35jIpPBxHt" / Twitter](https://pbs.twimg.com/media/DgPToHxUcAE-MV1.jpg:large)
TENNIS on Twitter: "Nicolas Kiefer shares an epic #ThrowbackThursday photo of a very young, long-haired Federer, Haas and more: https://t.co/SmCb7RuuBI https://t.co/35jIpPBxHt" / Twitter
![Nicolas Kiefer, Germany, playing a backhand, tennis, the ITF Grand Slam tournament, French Open 2009, Stock Photo, Picture And Rights Managed Image. Pic. IBR-1186941 | agefotostock Nicolas Kiefer, Germany, playing a backhand, tennis, the ITF Grand Slam tournament, French Open 2009, Stock Photo, Picture And Rights Managed Image. Pic. IBR-1186941 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/0fd978c8fe70bbffe541609013da583a/ibr-1186941.jpg)
Nicolas Kiefer, Germany, playing a backhand, tennis, the ITF Grand Slam tournament, French Open 2009, Stock Photo, Picture And Rights Managed Image. Pic. IBR-1186941 | agefotostock
![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)