Rafael Nadal has insisted that he will bounce back from his defeat to Fabio Fognini in the third round of the US Open on Saturday.

Nadal's exit in five sets means that 2015 will be the first year in 10 years that the Spaniard has not won a Grand Slam title.

The former world number one, however, has vowed to take the positives from the Fognini loss and insisted that he has rediscovered his fighting spirit, which has been lacking during an injury-plagued period of his career.

"My mind allows me to fight until the end. That is something that I was missing for a while, that feeling that I am there," he told reporters.

"For the nerves, for the anxiousness that I had for a long time this season, I was not able to do it. I was not able to be fighting the way that I was fighting today. So it is an improvement for me. I take that like a positive thing."

Nadal's first Grand Slam came at the 2005 French Open and he has won 14 major titles in all.