Obi wan and mace are tied because mace beat sidious and obi beat darth vader who beat sidious. Yoda never won any fights, although as people have said we never saw him in his prime. Vader did beat windu but he was tricked. For on screen skill obi and mace look the best.
1-2) windu/obi wan
3) anakin
4-5) dooku/sidious
6) maul
7) yoda
8) qui gon
9) grevious
10) kit fisto
Using just who they beat doesn't work because some people who are pretty beast (eg windu or grevious, who has beaten at least 4 unknown Jedi) only fought once when they died. People who are saying the prequels are crap, they are, in many respects, better than the originals. Yes they got a few thing wrong (I disagree that the force is just meant to be wisdom because yoda moved the x wing out of the swamp; if you can lift things you can throw them. But the fights are actually very boring in the originals and are truly epic in the prequels. And whatever you think about the prequels, you are going to love them when you see the sequels brought to you by the lovely Disney.
Also I have ignored everything to do with the clone wars because it is just a crap spin off that happened to do well and now people are taking it seriously. They are making excuses to bring back characters from the dead, which is stupid. Clone wars isn't Star Wars and any real Star Wars fan over the age of seven feels the same way