Carlos Alcaraz powered into the semi-finals of the US Open on Wednesday as rival Daniil Medvedev battled through a brutal heatwave to join the Spaniard in the last four. 

Defending champion Alcaraz moved to within one win of a potential dream final with Novak Djokovic with an emphatic straight sets victory over German 12th Alexander Zverev.

Zverev had emerged as a dark horse after a marathon five-set win over Italy’s sixth seed Jannik Sinner on Monday.

But the German’s hopes of extending his stay in New York were obliterated by a devastatingly clinical performance from Alcaraz, who completed a 6-3, 6-2, 6-4 win in 2hr 30min on the Arthur Ashe Stadium court.

The victory leaves the 20-year-old Alcaraz firmly on course for another final showdown with 23-time Grand Slam champion Djokovic after their Wimbledon classic in July.

Djokovic faces unseeded American Ben Shelton in Friday’s other semi-final.

“I’m feeling really comfortable playing on this court, playing in New York,” said Alcaraz, who will face Russian third seed Medvedev in the semi-finals on Friday.

“I’m feeling strong. I think I’m ready for a great battle against Medvedev,” added Alcaraz, who has dropped just one set en route to the last four.

Medvedev had earlier secured his place in the semi-finals with a 6-4, 6-3, 6-4 victory over compatriot Andrey Rublev in punishing, furnace-like conditions that the Russian said endangered players.

New York has been sweltering in a heatwave this week, with high humidity and temperatures at Flushing Meadows on Wednesday hitting 35 degrees Celsius (95 Fahrenheit).

Tournament organisers confirmed that extreme heat measures were in effect for the quarter-final — but Medvedev was clearly unimpressed.

At one point during the third set, the 2021 US Open champion muttered to a nearby TV camera “one player is going to die and they’re going to see” as he grabbed a towel.

READ: Record-setting Djokovic and Gauff steam into US Open semi-finals