It was a day of upsets at the ongoing US Open on Tuesday. After world number two Simona Halep was stunned by Maria Sharapova, Britain’s Johanna Konta met the same fate.

Konta suffered a shock first-round defeat against unseeded Serb Aleksandra Krunic.

According to a report on BBC, 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.

Speaking after the match, 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”, she added.

Wimbledon champion Garbine Muguruza through to round 2

Wimbledon champion Garbine Muguruza made a winning start to her US Open campaign with a 6-0 6-3 win over Varvara Lepchenko.

The Spanish third seed has never progressed beyond the second round of the US Open despite winning the French Open in 2016 and Wimbledon last month.

She was never in any trouble on Arthur Ashe against the unseeded American Lepchenko as she completed the victory in one hour and three minutes, hitting 16 winners, more than double her opponent.

Former world number one and 13th seed Petra Kvitova enjoyed a straight sets 7-5 7-5 win over Jelena Jankovic.

Kvitota has reached the second round of all three grand slams she has taken part in since returning to action in May, following a lengthy injury layoff.

Fifth seed Caroline Wozniacki made the most of th 41 unforced errors by Romanian Mihaela Buzarnescu to cruise to a 6-1 7-5 win in their first round meeting.