What is it?
It's the Group E fixture between Brazil and Costa Rica where anything but victory could leave the Brazilians, one of the favourites in Russia, in a difficult position to advance to the knockout stages.
When is it?
Friday, June 22.
What time is kick-off?
It will start at 1pm BST.
What TV channel is it on?
You can watch live coverage on ITV or ITV HD. Alternatively, you can follow our live blog.
Where is the game being played?
It's taking place at the Krestovsky Stadium in Saint Petersburg.
What is the team news?
Brazil have been going to great lengths to make sure everyone knows Neymar is fit.
A day after he limped out of training and raised further doubts about his physical condition in Russia, Brazil's Football Federation was quick to tell the world the team's biggest star was just fine.
Brazil had a closed practice session on Wednesday, but the federation posted photos and a video of Neymar in action in training with the rest of the squad.
One of the photos showed the playmaker touching the ball with his injured right ankle.
The images showed him exchanging passes and making challenges. In a longer version of the video sent to journalists, Neymar took free kicks.
"Neymar practiced the whole time," Brazil later said on their official website. "He showed confidence and participated actively during the whole session."
What's the latest news?
Costa Rica are on the back foot having lost to Serbia in their opening game.
"I don't think it was clear that any team deserved to win that game, but sometimes football is very complex - there's a very thin line between winning and losing," Costa Rica midfielder Celso Borges said.
The Costa Ricans, however, will not fall into the trap of focusing all their defensive efforts on Brazil playmaker Neymar.
"If you concentrate too much on one guy, they can just put on another in attack, so you just have to be very organised, have good communication and marking. You can have everything planned but with this kind of player, it's tough," Borges added.
Even with a decent result on Friday, Costa Rica face an uphill task in their final group game against a Swiss side that drew 1-1 with Brazil in their Group E opener, but Borges said the squad could still advance to the knockout rounds.
"We Costa Ricans are capable of great things when we join together and stay tight. I always think there's a possibility," he said.
What are the odds?
Brazil 2/9
Costa Rica 18/1
Draw 11/2
What's our prediction?
Brazil have a solid record against their south American rivals with their only defeat in nine meetings coming way back in 1960. We're predicting a comfortable win for Tite's side.
Prediction: Brazil 2 Costa Rica 0.