What separates the top few from the many in a sport?
Mentality. The importance of the mental side of athletics was once brilliantly summed up by basketball legend Kareem Abdul-Jabbar: "Your mind is what makes everything else work." Tennis great Novak Djokovic further explains: "[Among the]top 100 players, physically there is not much difference. ... It‘s a mental ability to handle the pressure, to play well at the right moments."
So your mental game matters the most.