Casper Ruud is aiming to achieve a notable double of winning his first major title and becoming the new world number one.
The 23-year-old, who was beaten by Nadal in this year’s French Open final, said having the top ranking on the line is providing “extra motivation” after he reached a first semi-final in New York.
Ruud must make the final to have a chance of pipping Nadal to top spot. If he was to meet Spain’s Carlos Alcaraz for the trophy, the winner would become world number one.
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“I had no idea I could be number one when I started this tournament,” said Ruud.