Messi scores last-second winner - his 500th Barca goal - to send them top
Barcelona go top on head-to-head with dramatic win
Real still have game in hand over Barca
How has Lionel Messi missed that?! A corner comes all the way across goal and Messi, the top scorer in the history of El Clasico, has the perfect chance for his 500th Barcelona goal, but he puts it wide from four yards out. A remarkable miss.
We're into two minutes of injury time. Casemiro fouls Lionel Messi and half the Barca team are speaking to the referee. He's already been booked.
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Colin Reardon: Suarez really isn't Barca class - in the six-yard box - deadly. Elsewhere, non-event!
Alexander Turner: Magic! That's Carvajal added to the growing list of defenders who Messi has made to look like gormless statues.
Naveed Afzal: Bale is very limited as a footballer. Zidane is a big fan of Hazard and he would be a much better fit in this side.
Luis Suarez crosses from the right, it goes past Paco Alcacer and Jordi Alba lashes it wide at the far post.
I wish we weren't almost at half-time. Can we do a straight 90 with no break?
Lionel Messi, whose mouth is full of paper like he's come out of the dentists, has a shot from outside the box which is deflected wide by Casemiro. Referee says goal-kick. Messi can't believe it, but nobody can probably understand what he's saying.
Gareth Bale's return from injury has not gone to plan and he has to come off. It's not Isco - as everybody expected - who comes on, but 21-year-old Marco Asensio.
The biggest moment of his career?
Image source, ReutersCristiano Ronaldo is down now after being caught by Samuel Umtiti. The Barcelona defender is booked.
Gareth Bale has come off to get treatment - Real Madrid are down to 10 men at the moment.
This El Clasico has not disappointed, Real Madrid midfielder Luka Modric forces a good diving save from Marc-Andre ter Stegen with an effort from 25, maybe 30, yards.
Gareth Bale is down injured now...
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Sophie Gayter: What. A. Goal. Leo at his finest. Game on.
Naveed Afzal: WOW That was breathtaking by Messi
Dec: The most underrated player on the pitch gets his reward. Brings balance to the Real midfield. Great to watch.
Lionel Messi, still with a bandage on his mouth, is the all-time top scorer in El Clasico with 22 goals - although he had not scored in the last six matches with Real Madrid.
That's his 30th La Liga goal this season. In 29 games.
Lionel Messi scores his 499th Barcelona goal and it's a brilliant, crucial one. Ivan Rakitic plays the ball across the box and Luis Suarez lets it go. Lionel Messi takes a couple of touches - absolutely taking two Real defenders out of the equation - and sweeps home.
Image source, ReutersLionel Messi
Magic.
Barcelona have come out attacking since Real Madrid's goal but without creating an opportunity yet.
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Sam Scarborough: Laws of the game state that "any player bleeding from a wound must leave the field of play", so no, you're not allowed to.
Thanks for the rule check re Messi's wound, Sam...
A reminder of what the table looks like if Real Madrid win. They would be six points top with a game in hand, and the head-to-head advantage on Barcelona - which counts before goal difference.
Marcelo crosses in after Barca half clear a corner, Sergio Ramos hits the post from four yards out and Casemiro touches home the rebound at the other post. Suggestions of offside.
Real are an hour away from all but wrapping up the title.
Image source, ReutersCasemiro
A lot of world superstars on show - but it's a holding midfielder who has opened the scoring.
We haven't seen a close-up of Lionel Messi yet but he appears to have a bandage on his face. He's getting plenty of the ball now though, hasn't affected his football.
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Edward Taylor: Officiating very poor so far. 1 missed penalty and 2 offsides.