Nicolas Kiefer (born 5 July 1977 in Holzminden Lower Saxony) is a former German professional tennis player. He reached the semi-finals of the 2006 Australian Open and won a Silver medal in Men’s Doubles with partner Rainer Schüttler at the 2004 Summer Olympics in Athens. Kiefer’s career-high singles ranking was World No. 4 achieved in January 2000.
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