Off we go.

West Ham in white get us under way.

Image source, Getty Images

Things have quietened a tad in this one, but it's still end-to-end. Neither team are managing to keep hold off the ball for too long and it's ended up a very open game.

We're almost there. Graham Potter is all smiles as he walks to the away dugout.

This will be only the fourth time Aston Villa and West Ham have played each other in the FA Cup.

In two of the previous three ties, the winner of this match has gone on to win the competition.

Aston Villa

Aston Villa boss Unai Emery, speaking to ITV: "The history of this cup is important and of course, it is a way for us to get a trophy.

"Seven times Aston Villa have won [the FA Cup] and we have to focus on this competing as well.

"They are going to be motivated and this competition has been important - we want to be a protagonists in this competition.

"We have to try connect with our supporters."

Image source, Getty Images

Aston Villa are seven-time winners, although they last lifted the FA Cup in 1957.

Villa don't get turned over at home often. They're on a seven-match unbeaten run at Villa Park.

The hosts are forced into an early change as goalkeeper Shamal George goes off with a knock in the ninth minute.

Nathan Bishop replaces him.

Image source, PA Media

There's a pre-match lights show happening right now at Villa Park.

Almost match time.

Image source, Getty Images

Former Brighton striker Glenn Murray on the playing style of Graham Potter: "He's not rigid. He's not stuck in a system or a style. He's very fluid, and I think we even see that in-game. When I played under him, we would change formations two or three times in a single afternoon, which is quite a skill to be able to have your players understand everything you want from them and be able to change in-game.

"I mean, these changes weren't made at half time. He wasn't exactly sitting everyone down. It was an instruction from the sideline, and, lo and behold! We all knew our jobs, and how to change that style in-game, which I think is credit to his managerial capabilities.

"Graham is a very thought-provoking manager. He knows exactly what he wants, but he wants feedback from the players.It's a collective rather than a dictatorship. And he will meticulously study each and every opponent, and he will best plan the way to try and penetrate that opponent, to try and hurt that opponent, and obviously win games at the end of the week."

It is all Portsmouth so far - and it's all being played at a high tempo. They're flooding the Wycombe third in numbers at the moment.

Portsmouth come close early on! Paddy Lane charges at the hosts' defence before having a shot saved. Christian Saydee then attempts to backheel it towards goal but it's cleared off the line.

Good start from the visitors

This is the first FA Cup meeting between Aston Villa and West Ham since March 1980, with the Hammers edging the quarter-final tie 1-0 on their way to winning the trophy.

Here we go! Portsmouth get the ball rolling.

Chris Sutton
BBC Sport's football expert

Julen Lopetegui never felt like the right fit for West Ham, and we are about to find out whether Graham Potter can do any better.

Aston Villa boss Unai Emery is still fighting on the European front in the Champions League, as well as trying to get back in it for next season.

That has placed huge demands on his squad already - so you could argue that they don't need a cup run too - but I still think they will go through, especially because West Ham are badly missing the injured Jarrod Bowen up front.

Sutton's prediction: 2-1

Not long until things get under way in the first game of the evening.

The teams are out at Adams Park ahead of this one.

Image source, Getty Images

Kevin Nolan
Former West Ham first team coach on BBC Radio 5 Live

The West Ham fans complained about us in the last year with David Moyes and us as a squad.

We were not good enough at the end of that season [when we left the club].

We put them in Europe for three years on the spin. Did it get to the point where we had to go again?

With Graham Potter, the fans know who the manager is, and they want to watch good football.

I didn't hear anyone complain when we were successful.

I only heard them complain when we were in the bottom half of the Premier League table.

Aston Villa

Image source, Reuters

Aston Villa's Youri Tielemans, speaking to ITV: "In England the competition means a lot. It is the oldest cup - you always want to do well in this competition.

"I have good memories in the FA Cup. Having won it before [with Leicester] I know who special it is - to do it again would be amazing."

On the 150th anniversary kit: "The club has a big history and when I joined I knew it from the start.

"The way the club is run at the moment is really good and we want to make the club proud."

West Ham United

Image source, Getty Images

West Ham boss Graham Potter, speaking to ITV: "A fantastic football club, with a great history, tradition and ambition. There's a family feel to the club.

"Infrastructure and a well functioning academy with an ambitious board that wants to do well. That matches the ambition of everybody here - it just felt right."

On being out of management: "A lot of learning goes private, and you keep that as that's where the pain is.

"Like everything in life, it's not always positive.

"It's how you reflect and come back stronger.

"We are back into football and back into the brilliant industry that it is - I'm really excited."

On his one and only session with the players: "Met everybody at the training ground and tried to get my bearings.

"Prepared the team and ran through the ideas, and we have gone through some things - the response has been brilliant."

I think one of Graham Potter's strengths is taking good players and making them Champions League level.

Alexis Mac Allister, Leandro Trossard, Ben White, Marc Cucurella.