Lendl reached two Wimbledon finals on grass. Everyone still knows he wasn't that good on it. (Compared to other surfaces)
Nadal said HIMSELF this week that on any other surface he'd be playing some his best tennis yet but as it is grass he has to work very hard.
I think Nadal knows more about his game than us.
So according to that logic, the best person to ask whether you are a good poker player is.....you.
