Liverpool could, probably should, be two clear.

Daniel Sturridge darts in behind Jason Shackell, Philippe Coutinho's pass is perfection, but the striker's finish is brilliantly blocked by the shins of Tom Heaton as he pulls the old flying starfish.

So how much is the FA Cup worth to your team?

Ahead of this weekend's quarter-finals, BBC Sport delve into the maths behind an FA Cup run.

Play on a fruit machine to see how you hit the jackpot in the competition, plus much, much more here in the latest iWonder Guide.

Jonny Evans and Papiss Cisse squared up in midfield during that first half and television replays seem to show that both players spat at each other.

"Jonny Evans is not that kind of guy," says Paul Scholes on BT Sport. "What Papiss Cisse did afterwards is unforgivable."

Image source, Getty Images

John Motson
BBC Match of the Day commentator

"It's been an entertaining 51 minutes. Spurs ahead through Chadli before Ki's equaliser but the concern will be for the hospital report for Swansea centre-forward Bafetimbi Gomis."

Image source, Reuters

A half-hearted shout for a penalty from the visiting fans, but that would have been a travesty of justice if Burnley had got a spot-kick.

Martin Skrtel's tackle was untidy, limbs everywhere, but he took the ball from Ashley Barnes fairly and squarely.

Lee Clark has had little reason to be cheerful during his four-and-a-bit months in charge at Blackpool, and it's not going well on his return to Birmingham, who sacked him in October. Andrew Shinnie has given Gary Rowett's side a 1-0 half-time lead against the Championship's bottom club.

Wigan, one place and six points above Blackpool at the start of play, are halfway towards a third successive away win, leading in-form promotion-chasers Norwich 1-0 at the break thanks to South Korea midfielder Kim Bo-Kyung's second goal in two matches.

Blackburn have a comfortable 2-0 interval lead at Sheffield Wednesday, while Ipswich - who dropped out of the play-off places after Brentford won last night - are on course to climb back into sixth, as they are drawing 0-0 at Leeds.

Guy Mowbray
BBC Match of the Day commentator at St James' Park

"Wayne Rooney had a couple of chances, Emmanuele Riviere spurned a chance late on and perhaps should have had a penalty earlier in the game. Jonny Evans and Papiss Cisse made sure it was eventful end to the first half but it remains goalless."

Liverpool are buzzing around with intent. Raheem Sterling is getting plenty of change out of Ben Mee down the right wing.

Phil McNulty
BBC Sport chief football writer at Etihad Stadium

"Great relief for Manchester City with that goal from David Silva seconds before half-time. They had created the better chances but again it has been an uninspired performance. Nigel Pearson will be doubly angry now - a goal conceded and that clear penalty claim ignored."

BBC Radio Manchester

Former Man City striker Shaun Goater: "It's all about the pace of the cross. Superb from Kolarov. He drilled it in, Bony hit it at goal and Silva was there to tap in the ball as it fell to him."

Steve Wilson
BBC Match of the Day commentator

"A very good half from Queens Park Rangers. Charlie Austin has had three or four attempts at goal, one of which was beautifully struck but flew just wide. David Ospina has been the busier goalkeeper, but Robert Green has also had some work to do, stopping from Olivier Giroud and Santi Cazorla. It's been a good game."

Harry Kane peels off the shoulder of his marker and is picked out by Nacer Chadli's astute pass. Just offside though rules the linesman.

That was marginal.

Image source, EPA

Philippe Coutinho has these Anfield angles worked out.

After scoring from way out West against Manchester City at the weekend, the Brazilian almost produces a carbon-copy from distance and a tricky angle.

Just wide of the post with Tom Heaton nowhere.

Image source, Getty Images

Manchester City take the lead after their best move of the night. Aleksander Kolarov pulls back the cross, Wilfried Bony's shot is blocked, David Silva's follow-up is brilliantly blokced by Wes Morgan, but the ball runs free for the Spaniard to slot in from five yards out. Harsh on Leicester.

Six minutes of added time at White Hart Lane in the wake of Bafetimbi's Gomis on-pitch collapse earlier in the half.