Rafael Nadal is by far the greatest clay court player in tennis history and Hubert Hurkacz’s coach Craig Boynton offered some insight into what makes the Spaniard such a dominant force on clay. Nadal has been dominant on clay ever since he arrived on the tour as he is a record 13-time French Open champion and also owns the record number of titles at the Masters events in Monte Carlo, Rome and Madrid. “You’ve got to be able to transition from defense to offense and offense to defense is the short answer. When you watch Rafa, he played way behind the …