Match ends, Costa Rica 0, Serbia 1.
Aleksandar Kolarov scored a spectacular free-kick to give Serbia a deserved victory in their opening World Cup Group E match against Costa Rica.
Serbia captain Kolarov - the former Manchester City defender - scored from 25 yards when he curled the ball over the Costa Rica wall.
Kolarov's effort had sufficient bend to find the top corner with Real Madrid goalkeeper Keylor Navas clutching at thin air as he desperately scrambled across goal.
Costa Rica only sporadically threatened the Serbia goal, with an early header over the crossbar from unmarked defender Giancarlo Gonzalez their best effort.
With games against Brazil and Switzerland to come, this was a key match for both nations to press their credentials to reach the knockout stages.
Mladen Krstajic's Serbia side now appear the best placed of the two to progress after a dominant second-half display.
The margin of victory would have been greater had Navas not narrowed the angle to deny Newcastle striker Aleksandar Mitrovic after he had been sent clear by the impressive Sergej Milinkovic-Savic earlier in the game.
Serbia's Nemanja Matic, meanwhile, was involved in an ugly confrontation with a member of the Costa Rica coaching staff in injury time as the Manchester United midfielder tried to retrieve the ball after it went out of play.
- See how the players rated in Serbia's win over Costa Rica
- Relive Serbia's win over Costa Rica as it happened
Serbia overcome opening day nerves
Before this encounter Serbia had managed one victory in their last six World Cup tournament matches, and lost both of their opening World Cup group games as an independent nation following the break up of Yugoslavia.
Optimism in the Balkan state heading into this tournament was not particularly high.
Indeed the country's football association cancelled an open-top bus parade in Belgrade as part of a send-off to the tournament because they predicted such a lukewarm reaction.
After a cautious start in this match there are some encouraging signs that Krstajic's blend of a gnarled experienced defence combined with a youthful technically-gifted midfield could make an impression.
"There are no clans or cliques in this squad for the first time in a long time," Krstajic said. "The basics of success are a good atmosphere in a team."
The creative talents of Milinkovic-Savic were particularly eye-catching and there is the sense that he must follow this impressive showing against stronger opposition.
A sterner test of Serbia's capabilities will come in their remaining Group E games with Brazil and Switzerland but after a low-key build-up, this was an encouraging display.
Los Ticos look past their sell-by date
Costa Rica were one of the surprise packages of the 2014 World Cup as they topped a group which included former winners England, Italy and Uruguay en route to the quarter-finals.
That side became synonymous with a fearless approach against more illustrious opponents.
Many of their squad were at the peak of their careers during that tournament, but the Ticos have the second-oldest squad at this year's tournament.
Their starting line-up in this match had an average age of 29 years 346 days. Francisco Calvo, at 25, was their youngest player.
Against Serbia, the Ticos looked like a side whose best days were behind them.
Costa Rica coach Oscar Ramirez made good on a promise to shave his head if they qualified for this tournament.
However, it appears unlikely they will get out of the group stages now they are here in Russia.
Man of the match - Sergej Milinkovic-Savic (Serbia)
Ivanovic takes caps record - the stats
- Serbia have won their opening game at a World Cup tournament for the first time since 1998, when they did so as Yugoslavia against Iran (1-0).
- Serbia have now won all four of their World Cup games against teams from the CONCACAF region, with the first three of those coming as Yugoslavia between 1950 and 1998.
- Costa Rica suffered their first defeat at the World Cup since 2006 (1-2 v Poland), ending a run of five games unbeaten in the competition (W2 D3).
- This is just the second time in five World Cup tournament appearances that Costa Rica have lost their opening game, with the previous instance coming in 2006 at the hands of tournament hosts Germany (2-4).
- Aleksandar Kolarov's goal for Serbia was the third direct free-kick scored at this year's World Cup (after Russia's Aleksandr Golovin and Portugal's Cristiano Ronaldo), which is already as many as there were in the entire 2014 tournament in Brazil.
- Kolarov's strike was also the first direct free-kick scored by a Serbia/Yugoslavia player at a World Cup tournament since 1998, when Sinisa Mihajlovic netted against Iran.
- Costa Rica had two shots on target in the opening three minutes, then didn't manage another until the 91st minute.
- Branislav Ivanovic made his 104th senior appearance for Serbia in this game, overtaking Dejan Stankovic (103) to become their most capped player.
'This isn't over yet' - what they said
Costa Rica coach Oscar Ramirez: "We play against the second and sixth-placed teams in the Fifa rankings.
"It's going to be difficult, but I just told my team: 'This isn't over.'
"We should've capitalised on our opportunities like they did. We had our tactical plan in place and with the subs, we tried to attack them on the wings. We tried to execute our plan but they managed to score on a set-piece. What can you do?"
Serbia coach Mladen Krstajic: "My players had the right attitude and approach: unity. We had to be a compact unit in both defence and attack and that's most important.
"What's most important for me is that we played as a team and we were focused. We have to be planted firmly on the ground and continue as a team.
"I'm a person who likes to take responsibility and even if we had lost, I would've come here to analyse the match to the best of my abilities. I'm very happy and proud of my players for their team effort."
Costa Rica face Brazil in St Petersburg in a 13:00 BST kick-off on Friday 22 June, while on the same day Serbia meet Switzerland in Kaliningrad at 19:00.
- 20GuzmánBooked at 56minsSubstituted forColindresat 73'minutes
- 15CalvoBooked at 22mins
- 11VenegasSubstituted forBolañosat 60'minutes
- 21UreñaSubstituted forCampbellat 67'minutes
- 6IvanovicBooked at 59mins
- 10TadicSubstituted forRukavinaat 83'minutes
- 22LjajicSubstituted forKosticat 70'minutes
- 9MitrovicSubstituted forPrijovicat 90'minutesBooked at 90mins
- Malang Diedhiou
- Shots on Target
Second Half ends, Costa Rica 0, Serbia 1.
Aleksandar Prijovic (Serbia) is shown the yellow card.
Delay over. They are ready to continue.
Video Review: Red Card. Referee decision on field stands.
Delay in match (Costa Rica). Video Review.
Offside, Costa Rica. Bryan Ruiz tries a through ball, but Christian Bolaños is caught offside.
Attempt blocked. Bryan Ruiz (Costa Rica) left footed shot from the centre of the box is blocked. Assisted by Óscar Duarte with a headed pass.
Delay over. They are ready to continue.
Delay in match (Serbia).
Daniel Colindres (Costa Rica) wins a free kick in the defensive half.
Foul by Nemanja Matic (Serbia).
Attempt blocked. Óscar Duarte (Costa Rica) header from the centre of the box is blocked. Assisted by Christian Bolaños with a cross.
Corner, Costa Rica. Conceded by Aleksandar Kolarov.
Attempt saved. Cristian Gamboa (Costa Rica) right footed shot from outside the box is saved in the centre of the goal.
Daniel Colindres (Costa Rica) wins a free kick in the attacking half.
Foul by Dusko Tosic (Serbia).
Attempt missed. Filip Kostic (Serbia) left footed shot from outside the box is just a bit too high. Assisted by Sergej Milinkovic-Savic.
Substitution, Serbia. Aleksandar Prijovic replaces Aleksandar Mitrovic.
Johnny Acosta (Costa Rica) wins a free kick in the defensive half.