Sunderland work the ball to Romaine Mundle unmarked on the left side of the area and he curls a first-time effort at goal but Matt Ingram punches away.

Oxford then attack down the right through Stan Mills but his cutback is intercepted by Luke O'Nien.

Lee Blakeman
Commentator on BBC Radio 5 Live at Bet365 Stadium

Kevin at the heart of it. He started the one-two and finished the one-two!

Leeds United

Image source, Getty Images

Leeds United midfielder Sean Longstaff, speaking to TNT Sports about whether he was nervous stepping up to take the winning penalty: "I think it makes it easier knowing that if you miss there's more penalties to come. But I thought Lucas [Perri] was massive today, obviously in the shootout but in the game, the first half especially.

"We've ground out a result. It's never pretty in the FA Cup but we're happy to get through.

"I think any time you get drawn away to a team in a lower division to you a lot of people expect you to rock up and win but it's never the case. I thought they were excellent today.

"Ultimately, it comes down to the moments and we were better in the bigger moments today and I'm really happy for Lucas because it's been - not sort of a tough time for him - but he deserves it today. I'm really happy for him."

So close to a second for Stoke!

Lamine Cissé embarks on a great run down the flank before cutting inside and then whipping a strong effort towards the far corner, but Benjamin Lecomte dives to tip the strike onto the post.

Dave Edwards
Former Wolves midfielder on BBC Radio 5 Live

The youngster, Mateus Mane comes onto it with his left foot and it is a poor finish.

Image source, Getty Images

A huge chance for Mateus Mane to wrap it up but he puts it well over.

Wolves host Arsenal in the Premier League on Wednesday.

They're going to have to work on their finishing.

Fulham have started this half well with Oscar Bobb more involved now than he was in the first half.

Dave Edwards
Former Wolves midfielder on BBC Radio 5 Live

Grimsby are still pushing late into this game. David Artell has rolled the dice, but it has not clicked in the final third for Grimsby in this second half.

Into the final 10 minutes.

Image source, PA Media

Cracking run by the lively Romaine Mundle, skipping several challenges to get into the Oxford box before teeing up Enzo Le Fee, but his shot is blocked.

Leeds United

Leeds United goalkeeper Lucas Perri, speaking to TNT Sports: "It was an incredible fight from the team. We had a very difficult game, it's always difficult to play against a team like Birmingham, so congratulations to the whole team for the fight and we got to the next round."

On preparing for penalties: "We had a video but unfortunately for the first two penalties because they didn't have the number on the shirt it was difficult for me to see. And the third one we didn't know where he shot so I went on instinct and happy to help the club."

Dave Edwards
Former Wolves midfielder on BBC Radio 5 Live

The way results have gone for Wolves and where they're sitting in the league, the FA Cup becomes a competition which can lift the mood.

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Good reactions by Jackson Smith to come flying off his line to get to the ball before Adam Armstrong. It wouldn't have counted had Armstrong scored - the Wolves player was offside.

Back under way at Oxford.

Back under way in this one as Stoke find themselves 45 minutes away from an upset.

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Grimsby send on fresh legs in the shape of Reece Staunton and Tyrell Sellars-Fleming. The League Two club are still to seriously test Wolves goalkeeper Sam Johnstone.

Wolves' fitness is starting to show but Grimsby are still in this.

The League Two side are pinned inside their own half as the visitors look to kill the tie off.

Guy Mowbray
Commentator on BBC Radio 5 Live

Wolves have not won away from home since last April after they won 1-0 away at Manchester United in the Premier League.

Image source, Getty Images

Phil McNulty
BBC Sport chief football writer at The Kassam Stadium

Oxford United's supporters giving referee Thomas Kirk a rough send off at half-time after awarding that contentious penalty for Christ Makosso's foul on Dennis Cirkin.

Their frustration is increased because Oxford United have acquitted themselves really well in that first half.