Literally every single last one.
It's funny that so many grown men like to retain hope that literally any of their heroes are "clean".
With everything we know about doping since the dawn of organized, competitive athletics
ESPECIALLY in the last 40-50 years
Y'all still believe in santa claus
Even thinking it's some dark secret or nefarious backfroom situation is grown men believing in fairy tales.
Every single professional athlete on the planet is using the latest cutting edge human advancement they can get their hands on.
Doping is always years ahead of testing, AND, it is in the best interest of the leagues/governing bodies to not catch people. We've seen this proven time and time again too.
If you believe athletes aren't doping you REALLY have to ask yourself what you're really believing in and why it matters so much to you.
I think a lot of it goes down to sheer ignorance as people still think doping = muscles hence the "BASKETBALL PLAYERS DON'T DOPE MUSCLES DON'T HELP YOU SHOOT" rhetoric despite the fact that the most elaborate doping systems and methods are geared entirely towards stamina, weight control, and recovery.