Premise: The 2008 Davis Cup was the 97th edition of the most important tournament between national teams in men 's tennis . This article details the list of men 's singles Grand Slam tournaments tennis champions . Rafael Nadal . Nadal has won 14 Grand Slam singles titles , the 2008 Olympic gold medal in singles , an all-time record of 30 ATP World Tour Masters 1000 titles , tied with Novak Djokovic , and a record 18 ATP World Tour 500 tournaments .
Hypothesis: Rafael Nadal is an athlete.
Label: ENTAILMENT