After a video showing Novak Djokovic's father posing for pictures with fans holding Russian flags, the Australian Open organizers have issued a reminder to players and their entourages about their policy on inappropriate flags.
Four fans with inappropriate flags and symbols were questioned by Victoria Police after Wednesday's quarter-final between Djokovic and Russia s Andrey Rublev.
A video posted on social media shows a supporter on the steps of Rod Laver Arena holding up a Russian flag with the image of President Vladimir Putin on it.
Late on Wednesday a video showed Djokovic's father Srdjan posing for pictures with fans holding Russian flags.
Players and their teams have been informed of the event policy regarding flags and symbols and to avoid any situation that could disrupt the game, Tennis Australia said in a statement on Thursday.
We work closely with event security and law enforcement agencies. Russian and Belarusian flags are banned from Melbourne Park during the tournament after a complaint from the Ukraine ambassador to the country.
Belarus is a key staging ground for Russia's war in Ukraine, which Moscow terms a special operation Photo on social media showed a fan in the crowd with a Z on his shirt.
Russian forces have used the letter Z as an identification symbol on their vehicles in Ukraine after the invasion. Some supporters of the invasion have also used the sign.
Russian and Belarusian players were banned from Wimbledon last year, but are able to compete as individual athletes without national affiliation at Melbourne Park.
Their flags are not displayed beside their names in TV broadcasts, as is the case for other players, and their nation is not indicated on draw sheets.