Re: Sharapova: a new Monica Seles?
These comparisons are always tenuous.
First of all, Monica was more of a matchplayer. Other than Hingis, there has not been a player as tactically astute in women's tennis since Chris Evert.
Maria is in no way, shape or form a tactical player.
Monica's serve was never a major weapon. Maria's serve, when she's playing well, is the bedrock of her game.
Monica was far more consistent, and fought through so many tough matches against quality opposition. Maria has lost rather a lot of close matches to top five players at slams, which she could have won had she played well when it mattered.
The similarity is that both have a desire to win which overrides all else (and dare I say it, that they both grunt). But that's not enough to uphold the comparison.