Which athlete do you consider to be the best in the world?

It's a pity there is no way to gather all the best tennis players of all time and hold a tournament between them. But I would root for Federer. Then again, even in those days, not all tennis players were on Sampras's level. Well, Agassi too. And that's it.

Only Agassi was truly on Sampras's level, but that is already enough, especially since the others were also decent. After all, even the presence of just one practically equal player sharply reduces the number of your victories in major tournaments, especially the Grand Slam series, almost by 2 times, plus it exhausts you mentally and physically. Divide Federer's victories by 2, and what remains?
Watching tennis now is boring, but if another worthy figure appeared, look, records would stop being updated so quickly and everything would be more exciting in general.