Phoenix1983
G.O.A.T.
Bolt never lost at the Olympics. You can't say the same for Nadal. Nadal lost twice, and he let three RGs get away from him (12/15 - 80%). Usain Bolt didn't lose a single race at the Olympics - even when his win relied on other runners (9/9 - 100%). Hell, if Usain Bolt lost one of those races, he'd still be ahead of Nadal in strike rate with an 89%.
His record is indeed 8/9 - you might be forgetting that one of the golds was stripped due to one of his team mates doping.