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Kiefer quits tennis to focus on family - CNN.com
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Kiefer criticizes Zverev and Thiem: "Questioning whether they have anything other than tennis balls in their heads · tennisnet.com
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4,819 Nicolas Kiefer Photos & High Res Pictures - Getty Images
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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