Follow game on BBC Radio 5 live
Winners play either Belgium or Japan (19:00 BST) in quarter-final
Neymar finishes Willian cross before setting up Firmino for second
Brazil never lost a World Cup game v opponents from central or north America
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Brazil 0-0 Mexico
Dion Dublin
Ex-Aston Villa striker on BBC Radio 5 live
Brazil have been so sloppy in the opening stages. If they start giving the ball away in the middle third they will be punished.
Brazil 0-0 Mexico
Andres Guardado feeds a lovely ball into the box and Alisson is forced to punch it away but it falls kindly for Hirving Lozano.
It's blocked well though by a Brazilian defender. Good start from Mexico.
Brazil 0-0 Mexico
Mexico's Andres Guardado is straight down the left wing, hoping to win a corner off Fagner. Instead, he trips up over the ball and it hits the corner flag before rolling out.
Brazil 0-0 Mexico
We're underway in the Samara Arena. Will it be Brazil or Mexico in the quarter-finals?
#bbcworldcup
Ian Evans: I'm still upset that Germany have been knocked out.
Jack Tanner: Scenes when Mexico squeak past Brazil, Belgium thrash Japan.... And England lose to Colombia.
Richard Pettinger: Another day another opportunity to see how far Neymar's acting skills have developed.
Brazil v Mexico (15:00 BST)
Today's main man is Italy's Gianluca Rocchi.
He took charge of the opening game in Group B, the 3-3 draw between Portugal and Spain, and awarded that penalty to Portugal after just four minutes.
He also made history in that match by consulting VAR for the first time at a World Cup.
He's given out seven yellow cards so far in the tournament, making him one of the more lenient referees - good news for those four players already on yellow cards.
Image source, AFPBrazil 0-0 Mexico
The players are out and the officials are out. Flags are waving and the national anthems are being belted.
Kick-off is just around the corner.
Brazil v Mexico (15:00 BST)
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Brazil v Mexico (15:00 BST)
Patrick Jennings
BBC Sport in Samara
Rafael Marquez - at 39 leading out Mexico against Brazil in the last 16 at his fifth World Cup. That is pretty incredible.
Brazil v Mexico (15:00 BST)
Brazilian midfielder Casemiro has stressed that his side must respect Mexico and can not just assume they are through to the quarter-finals despite being overwhelming favourites.
He said Brazil are taking nothing for granted after defending champions Germany finished bottom of Group F.
"The shirt doesn't win you the game. Look at Germany," said Casemiro.
"With all the players they have, all that favouritism, they were still knocked out in the first round.
"We always have respect, tranquillity and humility. We have to play football to beat Mexico."
Image source, EPABrazil v Mexico (15:00 BST)
Mark Lawrenson
BBC football expert in Russia
Brazil look like they are just starting to come to the boil. Neymar has not really got going yet but, when their attack clicks, the pace with which they come forward is frightening.
Prediction: 2-0
Brazil v Mexico (15:00 BST)
When the world's most expensive player managed to find the net against Costa Rica, Brazil went wild - and his sister dislocated her shoulder.
So watch out Rafaella Santos, your brother will be looking to get on the score-sheet again today. Stay away from hard objects.
It took Neymar 16 attempts to score his only goal at Russia. He's not been his usual self but it's easy to forget he's missed most of 2018 through injury.
Neymar has sparked debate in Russia with his dives, tricks and tears.
Hopefully he'll be doing more scoring and less of this today...
Neymar denied penalty after VAR review
Brazil v Mexico (15:00 BST)
Tim Vickery
BBC Sport South American football expert
Brazil haven't had a set captain in this tournament and I worry about it. I think Neymar needs someone to take him under their wing when he showboats a bit too much. In 2010 when he was just breaking through, Santos, his club at the time, were awarded a penalty in a league match. The manager stopped him from taking it, and he threw such a tantrum that the game was not able to restart for some time. The opposition manager at the time, said that we were creating a monster.
He hasn't come through street football where you have to toughen up to defend yourself, he has come from Futsal where the referee has been his protection. He still plays to the referee now but sometimes it is to the detriment of the team.
Brazil v Mexico (15:00 BST)
Whoever wins this afternoon will set up a quarter-final meeting with either Belgium or Japan on Friday.
After that, they will meet Uruguay or France in the semi-final and then one of England, Colombia, Croatia, Russia, Sweden or Switzerland in the final.
Who do you think will make it to the final? Let me know using #bbcworldcup
Image source, Getty ImagesBrazil v Mexico (15:00 BST)
Simon Gleave, head of analysis, Gracenote Sports:
"Brazil have been favourites to win the 2018 World Cup since before the draw was made. However, the Selecao's chance of becoming world champions dropped after their opening match draw with Switzerland. This was due to greater uncertainty of progressing past the group stage and returned to normal with the team's qualification to the last 16.
"Brazil's chance of lifting the Fifa World Cup on 15 July is now 25%, the highest it has been so far. There is still a long way to go though and currently Brazil are more likely NOT to win the World Cup than they are to win it."
Image source, BBC SportBrazil v Mexico (15:00 BST)
BBC Radio 5 live
Conor McNamara and Dion Dublin are in place and ready to bring you live updates from Russia on BBC Radio 5 live.
Build-up is already underway.
#bbcworldcup
Ibsy: I was going for a big upset with MEX going through, but then I thought that would be silly. BRA to progress
Jordan: If Brazil or Belgium get knocked out today I may just dare to dream that it's coming home. This world cup has just been completely mental!
Jamie: This Mexican team is nothing compared to the Mexico team from 1997.
Brazil v Mexico (15:00 BST)
Simon Gleave, head of analysis, Gracenote Sports:
"Mexico's win against Germany in their opening match of the World Cup increased their chances of winning the competition to 5%. This was because the Mexican team looked like topping Group F and avoiding Brazil in the first knockout match.
"After losing heavily to Sweden, Mexico ended the group phase in second place, so now face Brazil in the last 16 and their chance of winning the competition has dropped to 2%, lower than pre-tournament."
Image source, BBC SportBrazil v Mexico (15:00 BST)
Mexico have already beaten one of the giants at this year's World Cup. Can they do it again?
World Cup 2018 highlights: Germany 0-1 Mexico
Brazil v Mexico (15:00 BST)
Tim Vickery
BBC Sport South American football expert
Brazil is a little bit nervy today. Many of the Brazil fans know that Mexico have beaten them on a number of occasions recently, including the Olympic final in 2012. Ever since the 1970s, Mexico had seen Brazil as superstars until a match in 1999 when they pushed them close.
That was the turning point in this fixture because it gave them hope. To beat Brazil in a World Cup would be the greatest feat for Mexico. For Brazil to lose, it would be a disaster. So let’s see how the players react to this kind of pressure. Will Mexico be inspired or will Brazil be inhibited by the weight of expectation.