The mental gasoline
Concentration is real mental gasoline: some people have more of it, some others less.
But there are methods to train it or to reduce the effects of the falls of attention.
Concentration, mental gas in tennis, can be a sort of natural gift, however it’s a quality that can be trained match after match.
Not only: the more you play important matches, or tournaments, and the more this aspect improves.
Still some players (even professionals) feel remarkable decreases.