Britain’s Johanna Konta suffered a shock first-round defeat against unseeded Serb Aleksandra Krunic at the US Open.

Konta, seeded seventh, was among the favourites for the title and one of eight women who could have ended the tournament as world number one.

However, a first-serve percentage of just 45% allowed the clean-hitting Krunic to attack off the return, and the world number 78 fought back for a 4-6 6-3 6-4 victory.

Britons Kyle Edmund and Cameron Norrie had earlier claimed first-round victories in the men’s singles, but Heather Watson was beaten in the women’s singles.

Coming two days after Andy Murray’s withdrawal with a hip injury, Konta’s defeat means neither British number one player survived beyond the first afternoon.

Asked how she would deal with the defeat, she said: “I think not to catastrophise is important.

“It is a tennis match. It’s a sport. I think to have a healthy perspective on that, in general, goes a long way.”

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