Nicolas Kiefer, German tennis player
Nicolas Kiefer (German pronunciation: [ˈkiːfɐ]; born 5 July 1977) is a former German professional tennis player. He reached the semifinal 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.