Try your luck at The Oxford Scholar on cnr of Swanston and A'Beckett St. (427 swanston st if you wanna map it) It's a sports bar with a bunch of tele's, i've been in there a few times when down there for work and they've had NRL on one screen and AFL on others.
Just do yourself a favour and eat somewhere else, the food has gotten worse each time i've visited. Cheap, but fair average. Try Lounge Bar a block or two down for a really good feed. no footy though.
give them a call (03) 9663 1619 and check they're showing it, but i'd say they will be.. and probably a good usual crowd of gatherers too. Depends where in CBD you are.. easy to walk, even easier to jump on a tram on swanston st. stops pretty much out the front.