The next time Iga Swiatek takes her best friend Kaja Juvan out for dinner, bagels are unlikely to be on the menu.

The world number one and defending US Open champion thrashed Slovakian qualifier Juvan 6-0 6-1 to reach the fourth round at Flushing Meadows.

The pair had been out for a meal in New York just last week, and Swiatek spoke of their enduring friendship on the WTA Tour before the match.

But with friends like Swiatek, who needs enemies? The Pole surrendered just eight points as she raced away with the first set to love in only 33 minutes.

Juvan did at least avoid the dreaded ‘double-bagel’, finally getting a game on the board 40 minutes into the match for 3-1 in the second and raising her arms aloft in mock triumph to the acclaim of the Louis Armstrong crowd.

But it was only delaying the inevitable, with Swiatek wrapping up another clinical, statement victory – she beat Rebecca Peterson by the same scoreline in the first round – in well under an hour.

“I didn’t like that I was winning with my best friend but I knew I had to be focused and not think about that,” said the 22-year-old.

“It’s like playing your sister. I don’t have many friends and she’s my best friend so that was the toughest, for sure.”