![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
![Kiefer criticizes Zverev and Thiem: "Questioning whether they have anything other than tennis balls in their heads · tennisnet.com Kiefer criticizes Zverev and Thiem: "Questioning whether they have anything other than tennis balls in their heads · tennisnet.com](https://www.tennisnet.com/fileadmin/_processed_/d/1/csm_nicolas-kiefer_0ba1ca58f3.jpg)
Kiefer criticizes Zverev and Thiem: "Questioning whether they have anything other than tennis balls in their heads · tennisnet.com
![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
![Nicolas Kiefer at the Los Angeles Tennis Open Editorial Stock Image - Image of wide, professional: 11418909 Nicolas Kiefer at the Los Angeles Tennis Open Editorial Stock Image - Image of wide, professional: 11418909](https://thumbs.dreamstime.com/b/nicolas-kiefer-los-angeles-tennis-open-11418909.jpg)
Nicolas Kiefer at the Los Angeles Tennis Open Editorial Stock Image - Image of wide, professional: 11418909
Kiefer shows appetite for battle - The Royal Gazette | Bermuda News, Business, Sports, Events, & Community
![Nicolas Kiefer - Advantage Tennis Photo site, view and purchase photos of the Tennis player Nicolas Kiefer. Nicolas Kiefer - Advantage Tennis Photo site, view and purchase photos of the Tennis player Nicolas Kiefer.](https://www.advantage-tennis.com/kiefer/IMG_3696.jpg)