Carlos Alcaraz kept his US Open Title Defence on track after overcoming the challenge of Alexander Zverev to set up a semi-final meeting with third seed Daniil Medvedev.

The top-seeded Alcaraz brushed aside Zverev 6-3 6-2 6-4 and moved closer to becoming the first man to win consecutive titles at Flushing Meadows since Roger Federer collected five in a row from 2004-08.

He also became the second man in the Open era, behind Andre Agassi, to reach the last four at Flushing Meadows three times before turning 21.

Zverev, the German 12th seed, has proved he is back at the top of the sport this fortnight after eight months out following the horror ankle injury he suffered against Rafael Nadal at last year's French Open.

"To see him in the quarter-finals of a Grand Slam playing at his best, I'm so happy," said Alcaraz of his opponent.

The 20-year-old added: "I'm feeling comfortable playing in New York in this court. I'm showing my best level. I'm feeling good physically and ready for a good battle in the semi-final.