Let's do a small list =)

Men : Pete Sampras. I adored watching him play... Just beautiful.

Women : Martina Hingis. She's cute =)

The best or the cutest?
So many young beautiful tennis players out there, it's becoming more and more interesting to watch tennis Ana Ivanovic, Golovin.
Hingis is back because she didn't want to miss this opportunity I guess %)

I like Carlos Moya, Patrick Rafter, Safin, players who play fast and who are physically strong, those who've got some muscles. That's why I don't really like women tennis - they are very-very slow, there's no action

Women:
1. Steffi Graf
2. Martina Hingis
3. Monica Seles

Men:
1. Boris Becker
2. Pete Sampras
3. Roger Federer

__________________
In vino veritas...

You seem to forget about Williams sisters, for a couple of years they were winning everything that could be won. Now they are not in great shape, but I believe in their coming back in a couple of years.