Former world No. 3 David Ferrer isn’t stressing himself over Rafael Nadal’s setback as he is confident the record 21-time Grand Slam champion nas enough time to recover for the start of the clay season. This week, Nadal announced he suffered a rib stress fracture and revealed he’s expected to be out for four to six weeks. Ferrer, who was beaten by Nadal in the 2013 French Open final, now serves as the tournament director for an ATP 500 event in Barcelona. The Barcelona Open kicks off on April 18 and it’s hard to imagine that Nadal will be ready for the event. “I’m relaxed, really. I think Rafa has time to recover before the clay court swing,” Ferrer told AS, as revealed by We Love Tennis. Nadal was ‘devastated’ after suffering the setback “Hi everyone, I wanted to let you kno …