I agree that Radwanska and Hingis have similiar games but Hingis executed it much better, both patiently wait for the oppostion to make a mistake before they pounce but Hingis just did it with such grace and guile like no other player could ever equal her variety, Aga pales in comparison but I do like her game, it has the same variety which is much needed in the 'ball bashing' hum-drum tennis we see too much of today. Off court Hingis also played chess, spoke 5 languages fluently and acquired a great study in the 'male species' of which she became quite an expert on!
Wozniacki has magnificent shotmaking if you ask me, but it's not the power kind of one. She has to rely on all court tactics to make effective her sweet topspin mix, while still able to hit pretty decent winners when she feels them, especially with the backhand. Despite not making many winners, she's still an agressive baseliner, and she doesn't only win matches by waiting the opponent's mistake, though she can do that at times also.