Once, as a teenager, when Ferrer did not practice hard enough, his coach, Javier Piles, locked him in a completely dark 2m x 2m ball closet for several hours, giving him only a piece of bread and a bit of water. After this incident he was fed up with tennis and went to work at a construction site, but after a week he returned to Piles and asked if he could remain at the club and play tennis. Piles continued to coach Ferrer until they parted ways at the end of 2013. Ferrer has said he considers Piles to be like a second father to him.