No, me as well. I assumed it was the very fast sprinter, as he's the only world famous Olympian who most people will have heard of?
Really? Not the swimmer who has the record for most medals? Not the young diver? To name just two. You'd have to be pretty sports and particularly Olympics unaware to have only heard of the very fast sprinter
Anyway, it's none of them I'm thinking of
Someone in their first Olympics but who was already a several-times medallist.