https://www.techradar.com/news/how-to-watch-serbia-vs-brazil-live-stream-world-cup-football-free-from-anywhere

Serbia vs Brazil takes place on Wednesday, June 27 at the Spartak Stadium in Moscow, which holds nearly 45,000 people. 

Kick-off is 9pm local time, which is 7pm BST, 2pm ET, 11am PT, midnight AEST heading into Thursday morning. So you'll need to tune in at 8pm in Serbia and 3pm in Brazil.