Right-wing tennis hooligans have cast a shadow over the start of the Australian Open, putting a black eye on an event with a history already scarred by racial clashes.

A pack of Croatian thugs, armed with flares and flashing Nazi salutes, marched into Melbourne Park, menacing fans and attacking a photographer for Melbourne’s Herald Sun, the newspaper reports.

The photographer claims he was spat at and “slapped on the back of the head.”

“You certainly wouldn’t expect