Rafael Nadal has qualified for the US Open final after defeating Juan Martin del Potro 4-6, 6-0, 6-3, 6-2.

Sunday’s final against 32nd-ranked Kevin Anderson will be Nadal’s 23rd Slam, and third this year.

Anderson is the first South African to compete in the championship in 52 years, and will be aiming an upset against the world number one.

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Anderson beat 12th-seeded Pablo Carreno Busta of Spain 4-6, 7-5, 6-3, 6-4 to reach his first major final.

According to Nadal, the key to Friday's win was a change of tactics after the first set.

"I played too much to his backhand and I felt he was waiting for me there," said Nadal after his 15th successive Grand Slam semi-final win.

"I changed it and it worked very well. I made him move more and make it all more unpredictable."

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