You may discard Fantasy Football, but it is not easy to be a top player - there are thousands of people who spend a few hours a day practicing, and have been for years. It’s been a while, but when Magnusen rose from “not playing”’to the top spot it was impressive and unusual.
Emanuel Lasker was iirc a very noted mathematician. As I mentioned, this is from memory. I’ve known a person who had both made the national swim team as a 19-year old, and was a national bridge champion in his thirties (not in the US).
I don’t know to separate talent from work ethics, but my layman’s impression is that that these aren’t simple, and definitely not independent, measures across fields.
Also I would claim that talent is domain-specific insofar that very few people have a mental and a physical talent at the same time. For instance there are professional athletes who are very good in some other sport but I know of no one who is also very good at chess.