Does anybody see Kuznetsova-Sharapova developing into a rivalry?
There's only 2 years between them, as there was with Evert and Navratilova (not that I'm suggesting any rivalry with be as enduring as theirs).
I think they are both very well matched up. Maria's the cleaner hitter and mentally the more tenacious, but Kuznetsova is by far the greater athlete with the physical strength to muscle back Sharapova's shots and the stamina to outlast her. Both have great serves, but Svetlana has more variety. Having said that, Sveta is also far more erratic.
They go back as far as Wimbledon 2003, when Kuznetsova won a close encounter. Then they played at the Australian Open of 2005, Sharapova emerging the winner of a three-setter on sheer grit and determination after Kuznetsova had blown her lead. And then, this year in Miami Svetlana emerged the winner.
They've played very seldom over the last 3-4 years, but I think that bodes well for their future encounters. I personally don't feel Kuznetsova is anywhere near her peak. She still has to discover her 'a' game and learn to schedule herself better. Her attitude and focus on court also leaves a lot to be desired at the moment. But she's one of the most committed and intense athletes off the court, of all the elite players. Maria is much more the finished article, more glamourous, mentally the stronger. Both will be at the top of the game for most of the next decade barring injuries or tragedies.
I think we will see some great matches from these two.