Here come the players - deafening cheers for Emma Raducanu and Carlos Alcaraz as they enter the court.

BBC Radio 5 Live

Don't forget, you can listen to BBC Radio 5 Live's US Open preview show right now. Click the 'watch live' button at the top of the page.

One star who won't be playing today is world number one Jannik Sinner.

Sinner withdrew from the mixed doubles after retiring during Monday's Cincinnati Open final against Carlos Alcaraz because of illness.

The Italian was due to partner Katerina Siniakova of the Czech Republic in a first round match against women's world no.18 Belinda Bencic and men's world no.3 Alexander Zverev.

Bencic and Zverev will now face American duo Danielle Collins and Christian Harrison in round one.

Image source, Getty Images

Just catching up on the mixed doubles championship? Here's how it works.

Sixteen teams entered the first round today, with the eight winners then playing in round two later on.

The semi-finals and the final will take place on Wednesday.

Just four games are required to win a set in matches before the final, with no advantage scoring (four points will be needed to win a game) and 10-point match tie-breaks instead of a third set throughout.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

Image source, BBC Sport

Look who it is!

This was our first glimpse of the Raducanu-Alcaraz partnership hitting the court together.

The pair hit the practice courts about 1pm here (18:00 BST) for their first tune-up.

Alcaraz and Raducanu hit to each from the baseline before they were joined by her coach Francis Roig and his brother Alvaro. Hits and giggles aplenty.

Didn’t see Alcaraz and Raducanu (have we got a team name yet?) on the same side of the net though.

Iga Swiatek and Casper Ruud have just advanced to the semi-finals with a 4-1 4-2 win over Caty McNally and Lorenzo Musetti.

Next up at the Arthur Ashe Stadium is the one we've all been waiting for.

While we wait for Jack Draper, Jessica Pegula, Carlos Alcaraz and Emma Raducanu to take to the court, why not have a listen to BBC Radio 5 Live's US Open preview show?

Kelly Cates, Pat Cash, Naomi Broady and Charlie Eccleshare are discussing all the hot topics including Raducanu's new coach, the controversial mixed doubles, and more.

Listen by clicking 'watch live' at the top of the page.

Hello and welcome to day one of the US Open mixed doubles championship!

We've got a cracking match-up to bring you this evening, as British number one Jack Draper and world number four Jessica Pegula take on British women's number one Emma Raducanu and five-time Grand Slam winner Carlos Alcaraz.

There's been controversy surrounding the revamped mixed doubles competition, but it promises to be a lot of fun.

Let's get stuck in, shall we?