Australian Open: Z t-shirts explained as police crack down on wave of pro-Russia displays
Novak Djokovic jokes about his age at the Australian Open
Victoria police have been drafted in to question Australian Open spectators who unveiled symbols in support of Russia and president Vladimir Putin during this week's tennis action. One supporter was seen sporting a t-shirt with 'Z' on the front, while others gathered and chanted outside Rod Laver Arena.
Aussie Open chiefs were forced into a tricky position when a Russian flag was brought to the match between Kamila …