Nadal: I may not win another grand slam

Rafael Nadal has admitted that he is unsure whether he will win another grand slam after he failed to do so for the first time in a decade this year. 

Nadal currently sits on 14 grand slam titles, but should he win another one, he will surpass Pete Sampras into second on the all-time list. 

However, the world number five, who only won the Argentina Open, Mercedes Cup and Bet-At-Home Open this season, believes that he may not be capable of adding to his grand slam titles tally. 

“I don't know when I'll be able to win another grand slam, or if I'll be able to win one,” Nadal, who is currently representing the Micromax Indian Aces in the International Premier Tennis League, told reporters in New Delhi. 

Nadal’s disappointing season has led to mounting calls for him to switch coaches, but the Spaniard reiterated that he will not part ways with Toni Nadal, who is his uncle. 

“Without Toni (Nadal), none of this would have been possible,” he said. “I feel very fortunate to have someone from my family be my coach. For me, it's a big advantage.”

Nadal conceded that 2015 was not a highly successful year for him as he only won three titles, but the 29-year-old pointed out that he did end his season on a high as he beat Andy Murray and reigning French Open champion Stan Wawrinka at the ATP World Tour Finals in London before going on to record runner-up finishes at the China Open in Beijing and the Swiss Indoors in Basel. 

“Things were much better over the last three months, although 2015 wasn't my best season,” he said. “I'm pleased with how I'm playing now. I have to stay on the same track through the end of the year. I improved in the last few tournaments. I'll have to work to maintain my level and start winning again.”