I've only been a fan for like 10 years so.....in that amout of time, here are the greatest (top 5) players I remember (in NO particular order):
among this decade...I would UNQUESTIONALBLY say:
SERENA WILLIAMS AND ROGER FEDERER
Hate if you must, but...."the Serena Slam", not even Hingis could do that...hell not even Seles could! It takes something special to be able to win four major in a row! In fact, no other active player has a career Grand Slam...again something not even Hingis or Seles could do! When Justine can do that...against a completely competitive and active field (2002-2003 was a GREAT strectch of tennis...[Dokic was top 10!] and everyone at the top was competing at a high level...Serena just beat everyone else) then, maybe she can possibly tie Serena as the greatest of this decade. Sharpova fans...sorry, Masha is good...great even..she might even be #1 eventually, but Serena's been to at least the quarterfinals of the last 15 Grand Slams that she has competed in...Masha couldn't even do it for four...yet. Everyone else....get real! Venus is the only clear runner-up to Serena, but since Serena eclipsed her sister so greatly...there really is nothing futher to say!
Roger is AMAZING! He makes tennis look so freaking easy, I almost wanna quit. He will whip top 5 players and not even break a sweat. In the ATP, a balanced field has been what the tour has boased about, but now, although the field is balanced, one player stands above the rest. Yeah he has off days (he should have won in Athens), but who doesn't? At least he shows up where and when he needs to. Three Grand Slam titles in one year is something that not even Sampras could do, and he's the God of Tennis! In one year, Federer has gone from no grand slam titles and being the, "Next Best Thing", to four Grand Slam Titles (dropping only ONE set en route) and being the "Greatest Thing Ever!" He has secured the year-end ranking with over two months of competitive tennis left! No one has done that before! He is awesome and by far the best of this decade. Roddick has a great serve and lots of emotions, but in a pinch, I wouldn't bet my mom's heart surgery money on Roddick over Federer! Federer is the best of the 2000 decade...along with Serena Williams!
Career Grand Slam in your 20s? Been there done that. Career golden slam your 30s?
There's only 1. Serena.