![Germany's Christopher Kas reacts during his Tennis Davis Cup World Group first round match against Stefan Koubek of Austria in Garmisch Partenkirchen, southern Germany, Sunday, March 8, 2009. (AP Photo/Kerstin Joensson Stock Germany's Christopher Kas reacts during his Tennis Davis Cup World Group first round match against Stefan Koubek of Austria in Garmisch Partenkirchen, southern Germany, Sunday, March 8, 2009. (AP Photo/Kerstin Joensson Stock](https://c8.alamy.com/comp/2P8T10X/germanys-christopher-kas-reacts-during-his-tennis-davis-cup-world-group-first-round-match-against-stefan-koubek-of-austria-in-garmisch-partenkirchen-southern-germany-sunday-march-8-2009-ap-photokerstin-joensson-2P8T10X.jpg)
Germany's Christopher Kas reacts during his Tennis Davis Cup World Group first round match against Stefan Koubek of Austria in Garmisch Partenkirchen, southern Germany, Sunday, March 8, 2009. (AP Photo/Kerstin Joensson Stock
![Germany's Christopher Kas plays in the double Tursunov/Kunizyn (Russia) against Mayer/Kas (Germany) during the Tennis World Team Cup at Rochusclub in Duesseldorf, Germany, 21 May 2012. Photo: CAROLINE SEIDEL Stock Photo - Germany's Christopher Kas plays in the double Tursunov/Kunizyn (Russia) against Mayer/Kas (Germany) during the Tennis World Team Cup at Rochusclub in Duesseldorf, Germany, 21 May 2012. Photo: CAROLINE SEIDEL Stock Photo -](https://l450v.alamy.com/450v/2nb3b91/spains-rafael-nadal-foreground-looks-at-the-ball-as-he-plays-with-his-compatriot-marc-lopez-against-germanys-christopher-kas-top-left-and-austrias-alexander-peya-top-right-at-the-shanghai-masters-tennis-tournament-in-shanghai-china-tuesday-oct-11-2011-ap-photoandy-wong-2nb3b91.jpg)
Germany's Christopher Kas plays in the double Tursunov/Kunizyn (Russia) against Mayer/Kas (Germany) during the Tennis World Team Cup at Rochusclub in Duesseldorf, Germany, 21 May 2012. Photo: CAROLINE SEIDEL Stock Photo -
![Christopher Kas, right, and Philipp Kohlschreiber from Germany, look on in their match against Jeremy Chardy and Nikolas Mahut from France during the doubles match between Germany and France in the blue Christopher Kas, right, and Philipp Kohlschreiber from Germany, look on in their match against Jeremy Chardy and Nikolas Mahut from France during the doubles match between Germany and France in the blue](https://c8.alamy.com/comp/2P8TN32/players-of-the-german-tennis-davis-cup-team-christopher-kas-philipp-kohlschreiber-nicolas-kiefer-rainer-schuettler-captain-patrik-kuehnen-and-andreas-beck-from-right-pose-for-photograph-prior-to-the-training-in-garmisch-partenkirchen-southern-germany-on-tuesday-march-3-2009-the-german-davis-cup-team-will-play-against-the-team-of-austria-during-the-first-round-matches-from-friday-march-6-until-sunday-march-8-2009-ap-photochristof-stache-2P8TN32.jpg)
Christopher Kas, right, and Philipp Kohlschreiber from Germany, look on in their match against Jeremy Chardy and Nikolas Mahut from France during the doubles match between Germany and France in the blue
![Germany's Christopher Kas plays in the double Tursunov/Kunizyn (Russia) against Mayer/Kas (Germany) during the Tennis World Team Cup at Rochusclub in Duesseldorf, Germany, 21 May 2012. Photo: CAROLINE SEIDEL Stock Photo - Germany's Christopher Kas plays in the double Tursunov/Kunizyn (Russia) against Mayer/Kas (Germany) during the Tennis World Team Cup at Rochusclub in Duesseldorf, Germany, 21 May 2012. Photo: CAROLINE SEIDEL Stock Photo -](https://c8.alamy.com/comp/D62FR3/germanys-christopher-kas-plays-in-the-double-tursunovkunizyn-russia-D62FR3.jpg)
Germany's Christopher Kas plays in the double Tursunov/Kunizyn (Russia) against Mayer/Kas (Germany) during the Tennis World Team Cup at Rochusclub in Duesseldorf, Germany, 21 May 2012. Photo: CAROLINE SEIDEL Stock Photo -
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