Who is the tallest-ever world tennis number 1, Marat Safin or Melanie Oudin?
Marat Safin: Marat Mubinovich Safin (Russian: Мара́т Муби́нович Са́фин ; ] , Tatar: Марат Мөбин улы Сафин "Marat Möbin uğlı Safin" ; born 27 January 1980) is a Russian politician and retired professional tennis player. Marat Safin:  Nobody taller than Safin has ever reached his world number-one ranking.
i don't know