Carlos Alcaraz has revealed he asked Rafael Nadal whether it was a ‘hard day’ when the tennis icon recently confirmed his retirement. The 38-year-old confirmed last month that he would be walking away from the sport after a glittering career that has seen him win 22 Grand Slam titles. Nadal will play for Spain at the Davis Cup later this month before hanging up his racket. And Alcaraz, who is set to grace the court alongside the veteran, has admitted he’s been left saddened by his compatriot’s decision to call it a day. “I asked him if it was a hard day when he announced his retirement, if it …