Friends on Facebook are calling it a lucky break for the racist who taunted and threatened an Australian cage fighter champion.

In the second recent publicised racist attack on Melbourne's public transport system, cage-fighting bantamweight champion and former Brazilian jiu-jitsu world champion Gustavo Falciroli and his family were threatened last Saturday on the South Morang line.

A man approached Mr Falciroli after hearing him speak in Portuguese and told him that this was “not his country”. He then threatened to "cut" and "rape" him, his wife and two children.

Mr Falciroli got off the train and called police. His aggressor was intercepted at Reservoir railway station.

“Despite it [being] a bad situation, once again life has showed me that violence just creates more violence and I never should use my skills outside a cage, a ring or a mat," Mr Falciroli said on social media.