2018 ScheduleAll times ET
Costa Rica coach Oscar Ramirez said there was little more his team could have done after being eliminated from the World Cup in a loss to Brazil.
Brazil will get the headlines for leaving it late, but the biggest triumph was having Neymar's penalty overturned by VAR review.
Coutinho raced onto a touch from Gabriel Jesus and prodded the ball past Keylor Navas, with Neymar firing in from close range in the final seconds.
After wins for Brazil and Nigeria, Friday wraps up with a clash of European counterparts.
Costa Rica coach Oscar Ramirez could task two of his players with man-marking Brazil playmaker Neymar.
Brazil coach Tite has confirmed that forward Neymar will start against Costa Rica on Friday, after he left training on Tuesday with an injury.
Serbia needed a moment of pure quality from their defender to see off a resilient Costa Rica side, whose hopes of progress already look bleak.
Superb strike enough for 1-0 win over Costa Rica in scrappy match at the Samara Arena.
Favourites Brazil and Neymar open the tournament with Switzerland, after world champions Germany were stunned by Mexico and Serbia beat Costa Rica.
Serbia and Costa Rica begin their World Cup campaigns on Sunday with the teams likely to adopt contrasting approaches.