Image source, Getty Images

Former world number one Andy Murray faces a tough opening match against Greek third seed Stefanos Tsitsipas in New York.

The 34-year-old, who reached the third round of Wimbledon in July, is ranked 114th in the world and showed encouraging signs in the warm-up events in Cincinnati and Winston-Salem - despite going out in the second round at both.

Murray beat France's Richard Gasquet before defeat by Poland's world number 13 Hubert Hurkacz in the Cincinnati Masters, and overcame qualifier Noah Rubin at the Winston-Salem Open before losing to American Frances Tiafoe.

Japan's four-time major champion Naomi Osaka, American teenager Coco Gauff and men's second seed Daniil Medvedev are among those also playing on Monday. Here's a pick of the best:

In the women's draw...

• Naomi Osaka [3] v Marie Bouzkova
• Aryna Sabalenka [2] v NinaStojanovic
• Elina Svitolina [5] v Rebecca Marino
• Coco Gauff [21] v Magda Linette

And in the men's draw...

• Daniil Medvedev [2] v Richard Gasquet
• Andrey Rublev [5] v Ivo Karlovic
• Casper Ruud [8] v Yuichi Sugita
• Roberto Bautista Agut [18] v Nick Kyrgios

Image source, Getty Images

What about the rest of the Brits?

Dan Evans is closing in on victory against Thiago Monteiro on court 10, with the Briton leading by two sets to one and 5-1 in the fourth.

Heather Watson and Cameron Norrie follow in consecutive matches on the same court, which will now no longer host Johanna Konta following her withdrawal.

Here are those remaining court 10 matches featuring the British players today:

• Heather Watson v Kaja Juvan

• Cameron Norrie v Carlos Alcaraz

Meanwhile, over on court 15, Harriet Dart is in action against Caroline Garcia.

Some breaking news to bring you first of all.

British number one Johanna Konta has pulled out of the US Open, just hours before she was set to play her opening match on Monday.

Konta, 30, was due to face France's Kristina Mladenovic at about 22:00 BST and the reason for her late withdrawal is unclear.

Image source, Getty Images

The final Grand Slam of 2021 is upon us! In fact, day one at the US Open is already well under way.

History could be made in the next two weeks, and as ever there'll be twists and turns, drama and excitement throughout.

All of which will be enjoyed by capacity crowds for the first time at a Slam since the coronavirus pandemic.

And there's no doubt about the standout first round match-up. Britain's Andy Murray will be taking on third seed Stefanos Tsitsipas very shortly, so don't go anywhere...