I've seen that in the rules of ITST's Australian Open 2014 (doubles) it is the best of 5 sets that wins the game.
I was a bit curious and I went on the official website of the Australian Open and I've seen that it is actually the best of three sets, with a tiebreak played at six games-all. (http://www.ausopen.com/en_AU/event_guide/a_z_guide.html)
It's your choice to change that or not, I just wanted to inform you

Arvin97