Odds are we are going to see more virus flare ups, and Melbourne would be top of the list.
Why is Melbourne any more likely than anywhere else?
At some level, I would say all major capital cities are equally likely.
Those with international traffic are more likely.
Sydney and Melbourne, presumably having more people coming/ returning would be at greater risk.
Prima facie I'd suspect QLD to be at high risk, but they seem to have been more aggressive in their border restrictions.
Since Politicians insist on being reactionary, it's going to go in cycles. Sydney would have been top of my list, but they've now had theirs. They are clamping down, and will eventually get it under control.
I don't know how many people will be allowed in for the tennis, officials, support staff, etc, but that could also increase the risk for Melbourne.
I think that any Capital City is a bad risk for this type of tournie, even Perth. Our natural paranoia and isolation seems to have protected us, but I fear our turn may be coming.
If they could get the teams and officials in, without the disease, then Tasmania would have been about the only low-risk choice.