Premise: The 2008 Davis Cup was the 97th edition of the most important tournament between national teams in men 's tennis . A clay court is one of many different types of tennis court . Rafael `` Rafa '' Nadal Parera ( [ rəfəˈɛɫ nəˈðaɫ pəˈɾeɾə ] , [ rafaˈel naˈðal paˈɾeɾa ] ; born 3 June 1986 ) is a Spanish professional tennis player . He is widely regarded as the greatest clay-court player in history , and owing to his dominance and success on the surface , he has been called `` The King of Clay '' .
Hypothesis: Rafael Nadal is an athlete.
Label: ENTAILMENT