Staying fit is more important to Rafa Nadal in 2014 than adding to his 13 grand slam titles, the world number one was quoted as saying on Friday. Spaniard Nadal had one of the best season's of his career in 2013 following his return in February after seven months out with a knee injury, winning 10 tournaments including a record eighth French Open crown and a second U.S. Open title. "In that sense, and thinking about 2014, I am not going to talk at the moment about winning the ninth Roland Garros or winning Wimbledon again, which would be the third time. "You see it's not easy: I couldn't do that, for the whole season, in 2012, 2013." Nadal's 10 titles last season came close to matching the best year of his career, when he won 11 in 2005, including his first Roland Garros crown.