Daniil Medvedev makes short work of Stefan Kozlov at US Open

World number one Daniil Medvedev opened his US Open title defence by walloping American Stefan Kozlov 6-2 6-4 6-0 in sweltering conditions on Arthur Ashe Stadium. The Russian had an inconsistent run-up to Flushing Meadows but was back to top form on the court where he won his maiden grand slam title a year ago, sending across 10 aces and neutralising Kozlov's serve. The pair traded breaks early in the first set before Medvedev got his motor running, clinching the next four games as Kozlov won fewer than half of his first-serve points. Kozlov was no match for Medvedev's raw power in the second set. The American scraped his wrist and knee after he dived to retrieve the ball, but ended up falling to the ground heavily in the ninth game that saw Medvedev break him to love. He called on the trainer to tend to the injuries but Medvedev showed no mercy as he raced through the final set like a bullet train in just 27 minutes to set up a meeting with Frenchman Arthur Rinderknech in the second round.

Andy Murray recorded a straight-sets victory over 24th seed Francisco Cerundolo.

The 35-year-old went into the tournament having only won one match on the North American hardcourts this season and with concerns over persistent cramping, but this proved to be a relatively straightforward outing in the humid conditions.

Argentinian Cerundolo has won the majority of his ranking points on clay and Murray had to grind his way through plenty of long rallies on his way to a 7-5 6-3 6-3 victory, with the only real negative a failure to serve out all three sets.