Alex Howell
BBC Sport Arsenal reporter at Fratton Park

The Arsenal fans sing "set-piece again ole,ole". The Gunners are so threatening from corners.

They've stayed calm after going behind and have turned it around.

Image source, Getty Images

How many goals have Arsenal scored from set-pieces this season?

I've lost count.

Mark Schwarzer
Former Chelsea and Fulham goalkeeper on 5 Live at Fratton Park

It's a really well worked corner, causing confusion and utter chaos.

Portsmouth just aren't able to adapt.

Gabriel Martinelli is at the near post and he moves first for that ball.

Good flick on and good movement at the near post.

Ian Walsh
Former Wales striker on BBC Radio Wales

We never know what to expect with the FA Cup, do we?

For me, Swansea always have to start well, then progress and build into the game.

They have to start on the front foot today.

Mikel Arteta is standing on the edge of his technical area with his arms folded. The visitors win a corner after a challenge by former Arsenal youth player Zak Swanson on Noni Madueke.

Image source, PA Media

Leeds United

Leeds manager Daniel Farke speaking to TNT Sports: "Many compliments to the lads, back to winning ways because we know how difficult this was. It's always difficult when you miss so many chances like we did, you could easily lose these games.

"We were mature, disciplined and professional in this game and we were able to turn this game into something we deserved.

"After we adapted after 20-minutes we were the better side. We missed in the first half an unbelievable amount of opportunities.

"At half-time the message was don't get nervous, the goals are coming, stay on it and stay disciplined, a bit more switch on in our own box because one little detail can be costly in this situation but also, not to allow any counter attacks and to keep going.

"It's never easy for the players who are coming in especially where there is so much rotation, so many compliments. It is easy that you could fail in such a game."

Image source, Getty Images

By the way, Arsenal have gone out at the third round stage in the previous two seasons.

They're looking to reach the fourth round for the first time in three years.

Leeds United

Leeds forward Wilfried Gnonto, speaking to TNT Sport: "I am really pleased. We knew it was going to be tough coming here. I am happy with the win and happy with my performance.

"I think it's a good reminder of what the Championship can be. It was tough.

"I am happy for the finish. We train every day and it was a result of what we work on. I am confident in the position.

"We had a slow start and we worked our way into the game. We said [at half-time] to ourselves that we had to keep going."

On his team going far in the competition: "We want to dream and take our chances game by game, so hopefully we are going for something big."

Image source, Getty Images

Twenty minutes on the clock.

Portsmouth are snapping into challenges and not allowing Arsenal time and space.

The home fans love what they are seeing.

Image source, Reuters

It's a filthy day at Fratton Park but Portsmouth are handling the conditions well. A roar goes up as Gabriel Martinelli is harried by Terry Devlin.

It could be an interesting one, this.

While these two sides are separated by a whole league, Championship outfit Norwich are faring pretty poorly in the second tier while Walsall are flying high in League Two and pushing for promotion.

On paper, you'd still expect Norwich to progress. But confidence and form could come into play here.

Plus, Norwich have won just one of their last 12 home matches in the FA Cup (D4 L7).

Image source, Getty Images

Now an attempt by Harvey Blair which forces Kepa Arrizabalaga to get down and save.

Any fear Portsmouth might be overawed by the occasion have been dispelled.

Adam Cottier
BBC Final Score commentator at Bramall Lane

There are a few potential stories somewhere amidst the team rosters here at Bramall Lane.

There’s a Sheffield United debut for Ki-Jana Hoever, a potential final appearance of a short-term contract for Patrick Bamford and a rare start for Danny Ings.

Mansfield have Liam Roberts in goal. He made FA Cup headlines for the wrong reasons last season while at Millwall after colliding with Crystal Palace striker Jean-Philipe Mateta.

And on the bench, the Stags have three new signings and one of them - Victor Adeboyejo - hasn’t played for 11 months, while new loan signing Oliver Irow could make a senior debut after joining from Spurs.

Image source, Getty Images

Portsmouth are struggling in the Championship but they're going toe-to-toe with Arsenal.

Gabriel, Eberechi Eze, Gabriel Jesus. You can't call this a 'weakened' Arsenal side.

Image source, Getty Images

Dafydd Pritchard
BBC Sport Wales at the Swansea.com Stadium

In one of the tougher sells of this third-round weekend, Swansea host West Brom in a repeat of what was a league fixture between two Championship strugglers here only 10 days ago.

On New Year's Day, Jay Fulton's second-half strike gave the Swans a 1-0 win over the Baggies.

A week and a half is a long time in football because since then West Brom have sacked their manager Ryan Mason.

So it's former Baggies midfielder James Morrison who has been placed in temporary charge once again as his team, 18th in the Championship, visit a Swansea side one place and one point ahead of them in the table.

Image source, Getty Images

Chris Sutton
BBC Sport football expert

This is a must-win for West Ham boss Nuno Espirito Santo and, let's face it, they might sack him anyway even if he gets past QPR.

I don't think home advantage helps the Hammers, who suffered a catastrophic defeat against Forest at the London Stadium on Tuesday. I'm not sure how many of their fans will turn up for this game, and the ones who do are not going to be in a good mood either.

But while West Ham have been very poor recently, they still have some good players and they should surely still see off a mid-table Championship team on their own patch.

QPR have been knocked out in the third round of the FA Cup more times - 52 - than any other side since the current format of the competition started 100 years ago.

I am going for them to suffer defeat number 53, and for Nuno to survive a little bit longer.

Sutton's prediction: 2-1

Image source, Getty Images

Chris Sutton
BBC Sport football expert

West Brom have just sacked their manager Ryan Mason, so James Morrison is in charge for this one.

The Baggies could really do with a win but their form on the road is awful - they have lost 10 away games in a row.

Swansea changed their manager recently too, with Vitor Matos replacing Alan Sheehan in November, and their season has been just as disappointing.

While West Brom won 3-2 when these teams met at The Hawthorns in November, Swansea pinched a 1-0 win at Liberty Stadium on New Year's Day.

I'm going for another close game this time.

Sutton's prediction: 0-0 after extra time, Swansea to win on penalties

Mark Schwarzer
Former Chelsea and Fulham goalkeeper on 5 Live at Fratton Park

It's a great atmosphere and Portsmouth are holding their own at the moment.

Portsmouth just have to keep going, they have nothing to lose.

Harry: Given Portsmouth's troubles from set pieces, I think you couldn't possibly ask for a worse opponent to deal with a corner from.

Toby: What a game on our hands today, Arsenal as the league leaders and the underdogs Portsmouth as the underdogs. But we’ve seen the underdogs prevail many a time this weekend.