Good question - who knows but what is good is she's not going for crazy bludgeoning winners and is being very creative with her finesse and serves which tells me she's enjoying the battle and that's a very good place to be mentally.
This match is maybe the best match of the tournament so far. This match is gonna be long 40 minutes in 5 games, that is like 8 minutes per game. But Kuznetsova might go whereabouts if she wins this set, like she did against Woz.