The Spaniard fought from a set down to win in four sets against Juan Martin Del Potro in the early hours of this morning.
Tomorrow he will face South Africa’s Kevin Anderson, and should he prevail, it will be his 16th Grand Slam title.
Del Potro memorably beat Nadal in the semi-finals in 2009.
Since then, Nadal has won 15 matches in a row in the last four of Major tournaments.
And when asked what the secret is, Nadal said: “I don’t know. I just try my best every day.
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“It’s true when the rounds are coming you’ve already won a couple of matches.
“Every victory is confidence. I started the tournament playing a couple of rounds so so.
“After my third match, I thought that could be a turning point.
“The last three matches have been very positive and this one has been the best for me.”
Should Nadal clinch victory in New York, it will also be his third US Open title.