Rafael Nadal admits that he has not performed as well as he can this season after failing to reached the semifinals at any of the Grand Slams. But the 14-time major champion said that he could win another Grand Slam title in the future.
"I don't know if I can win another Grand Slam," Nadal told Sky Sportsin an interview to promote his academy (which is set to open in 2016 in Spain). "I believe yes. I don't know if I'm going to do it... but I can do it.
"I'm going to work hard to create more opportunities in the next couple of years, so let's see if I'm able to relax, to control my emotions again and if that happens, and I believe it will happen soon because I feel much better, I'm going to find my level of tennis."
At the French Open, the 29-year-old lost to Novak Djokovic in the quarterfinals, marking the first time the Serb beaten Nadal in six tries in Paris. Nadal then lost in the second round of Wimbledon to 102nd-ranked Dustin Brown.
As the hard-court season came around, the world No. 7 said that he was feeling better, but at the U.S. Open, Nadal went down in third round to Fabio Fognini.
"The first six months [of 2015] I was feeling very tired every time I was playing, every time I was practising," the Spaniard said. "Being honest with you, I suffered this year, especially for those months. [But] the last couple of months I'm enjoying again and I'm not worried about my tennis level."