World No. 7 Casper Ruud says Rafael Nadal is so humble and down to earth that if you met him on the street without knowing who he was you would never guess he’s a tennis superstar. Nadal, a record 21-time Grand Slam champion, is one of the greatest champions the game has ever seen. Nadal has been dominating the ATP Tour for nearly two decades but the fame and success never changed his humble demeanor. “It’s inspiring. I think his whole career has been motivating for other fans, players, people who are watching him,” Ruud told tennis.com.“If yo …