World No. 7 Casper Ruud has never played Rafael Nadal in a tour level match but he knows how it feels to play the Spaniard since he has practiced with the former world No. 1 several times. Nadal, the greatest clay court player ever, is missing the beginning of the clay season as he pulled out of the Monte Carlo Masters and Barcelona Open. Ruud, who is becoming a dominant force on clay, is a seven-time ATP champion and six of his seven titles came on clay. In an interview with the ATP Tour website, Ruud expla …