1) Agassi partner 2) Austrian earl 3) Continental earl 4) Court great Steffi 5) Court notable 6) Court pro steffi 7) Court star steffi 8) English boy name 9) Five-time US Open winner 10) Five-time US Open champ 11) Foe for Seles 12) German count 13) German court great 14) German earl 15) German tennis great Found on https://www.crosswordclues.com/clue/graf
Graf (male) or Gräfin (female) is a historical title of the German nobility, usually translated as count. Considered intermediate among noble ranks, the title is often treated as equivalent to the British `earl` (whose female version and consort is a countess). The comital title Graf is common to various European territories where German was or..... Found on http://en.wikipedia.org/wiki/Graf
Graf noun [ G. Confer -grave .] A German title of nobility, equivalent to earl in English, or count in French. See Earl . Found on http://www.encyclo.co.uk/webster/G/48