Victoria Police is using bilingual officers to monitor the chants of fans at the Australian Open and has issued a warning to disruptive and antisocial tennis supporters.

Greek-speaking police have been deployed to listen to chants from rowdy fans in matches involving Greek world No.6 Stefanos Tsitsipas and his compatriot Maria Sakkari.

Up to 20 Greek supporters were ejected from Melbourne Park on Wednesday evening for disruptive behaviour after Sakkari's match.

Stefanos Tsitsipas during his first-round match on Monday. Credit:AP

Some of the fans in the stands for that match wore T-shirts promoting the Hellas Fan Club, a group whose members were involved in a clash with police at the 2008 Australian Open, where they were supporting Greek Cypriot player Marcos Baghdatis.