Rafael Nadal believes the three major wins he needs to match Roger Federer's record haul of 19 men's singles titles in the Open Era represents a "big difference".
Nadal won the 16th grand slam of his career when he beat Kevin Anderson 6-3 6-3 6-4 in the US Open final at Flushing Meadows.
It represented the world number one's second major win of the year, the other being his historic 10th French Open victory, in a dramatic change of fortunes from an injury-ravaged 2016.
Nadal was beaten in the final of the Australian Open by Federer, the 36 year-old Swiss also winning his eighth Wimbledon title in a phenomenal return from knee and back issues the previous year.
Asked about matching long-time rival Federer's tally, Nadal said: "I really never thought much about that. I just do my way. He does his way. Let's see when we finish.
"Of course, if I won two grand slams this year and he did not win, we'd be closer, but he has 19, I have 16. So three is a big difference.
"I'm very happy with all the things that are happening to me, winning this title again. I have this trophy with me.
"It's so important, winning on hard court again. That's a lot of positive energy for me. Being healthy, you see everything more possible. With injuries, everything seems impossible.
"It's true that I am 31, I am not 25, but I still have the passion and the love for the game. I still want to compete and still feel the nerves every time that I go on court. While those things keep happening, I will be here."