Melbourne, Australia - Serbian, Croatian and Bosnian fans have threatened to ignite a Balkan boilover during early rounds at the Australian Open.
After a mini-riot on opening day in 2007, when 150 people were ejected from Melbourne Park and a police capsicum spray attack in the stands in 2008, this year's trouble was tame.
Tensions spilled over later at the beer tent with a few punches being thrown and several participants frog-marched out of the grounds by police officers.