Striker Richmond Boakye-Yiadom scored the opener as Red Star Belgrade secured a 2-0 first leg win over Sparta Prague in the third qualifying round tie.
The 24-year-old sublimely connected a low free-kick past goalkeeper Martin Dubravka.
Boakye has now scored six goals in five matches of this season's qualifiers.
Gabon star Guelor Kanga doubled Red Star's lead with the second goal on 65 minutes.
Boakye provided the assist for Kanga to finish home.
Watch Richmond Boakye's goal in Red Star Belgrade's 2-0 win over Sparta Prague: