Serbia, which missed out on the 2014 World Cup, had the early advantage in a tough group in Russian Federation that includes five-time champion Brazil and Switzerland, who were set to play later Sunday in Rostov-on-Don. Here is the line-up for the Group E opener at Samara Arena - Costa Rica: Navas; Gamboa, Acosta, González, Duarte, Calvo; Venegas, Guzmán, Borges, Ruiz; Ureña.
However, even Navas was unable to keep out Kolarov's free kick in the 56th minute as the Roma left back curled the ball over the defensive wall and into the corner past Navas's left hand, with the Costa Rican keeper at full stretch.
"It is great to have three points, but we are not finished".
Djokovic is an avid fan of the Serbian national team, which kicked off its World Cup campaign with a 1-0 win over Costa Rica in Russian Federation on Sunday.
They split possession with Serbia, had 10 shots just like their opponents and the same amount of efforts on target (three), but just couldn't create good enough chances to really threaten.
"I'm friends with Kolarov who scored an fantastic goal today, and (Nemanja) Matic, these guys", he said. Fancy being thrown into the deep end and taking charge of your country's opening match of the 2018 FIFA World Cup?More news: Mohamed Salah scores but Egypt face World Cup heartbreak
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.
"Now it is more hard, but there are two remaining games and we will go to win".
Bookmakers unanimously considered the favorite in this match, the Serbian team.
"We didn't qualify for last World Cup and the last two Euros, so we didn't get a chance to enjoy these matches for a long time". Costa Rica were also the only side to remain unbeaten except for penalty shootouts in the 2014 World Cup alongside Germany and Netherlands.
Milinkovic-Savic is one of the most sought after talents in Europe, whose stock will only rise if he delivers in Russian Federation.
Ivanovic went into the book for a foul on Johan Venegas soon afterwards, with the latter making way for Christian Bolanos as Costa Rica made the game's first change.