Like there were no epic matches in the past? All top players used to play both singles and doubles, 5 sets masters etc, yet I don't remember anyone here doubting 80s or 90s players.
You have GOT to be kidding me?
Of course there is massive speculation/cases about various stimulant use in this era. EPO wasn't even detectable at that point, so I wouldn't be surprised if that was in the mix.
Also, the courts were not slow as hell everywhere
back in those days. Less endurance required.
If its too good to be true, then it probably is.