Serbia: Few players will draw more attention from scouts this summer than Sergej Milinkovic-Savic. The dynamic midfielder is already linked with Manchester United, who have been quoted transfer fees approaching £100m by current club Lazio. It is easy to forget Milinkovic-Savic, born in Spain, has only two caps for Serbia, as comparisons of his playing style with past greats, ranging from Zinedine Zidane to Yaya Toure, flood in.Predicted line-ups:Costa Rica: Navas, Oviedo, Waston, Acosta, Gonzalez, Gamboa, Bolanos, Guzman, Borges, Ruiz, UrenaSerbia: Stojkovic, Kolarov, Nastasic, Ivanovic, Rukavina, Milivojevic, Matic, Kostic, Milinkovic-Savic The 2018 World Cup is in full swing now, with three days worth of games played – all of which have been live on talkSPORT.Today, Sunday, there are another three fixtures, the first of which sees Costa Rica take on Serbia from Samara. Navas is Real Madrid’s number one Key players:Costa Rica: There is no doubt that Keylor Navas is Costa Rica’s key player. Navas made his name at the last World Cup, and he has gone from strength to strength since then, joining Real Madrid and helping them win numerous trophies, including three European Cups in a row. 3 The Cosmos Arena will host Costa Rica v Serbia 3 3 Where can I stream Costa Rica v Serbia?Costa Rica v Serbia is live to stream on talkSPORT.com, or you can listen on 1089 or 1053 AM, DAB radio or through the talkSPORT mobile app.