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As much as i hate it, Melbourne is unrivalled in Australia when it comes to hosting major sporting events. You would have to imagine with the massive crowds that AFL pulls that Melbourne per capita is one of the best represented cities as well.
It does host nearly all the major recurring sporting events on the Australian Calender.. Australian Tennis Open, F1 Grand Prix, Boxing Day Test, Melbourne Cup and the AFL Grand Final..
The only events that really rival are the NRL Grand Final, Sydney to Hobart yatch race, Australian Golf Open and the Santos Down Under(rising in prominence)... Both the Bledisloe and State of Origin are obviously up there, but they have rotated through Melbourne at some point or another.