@Yogesh : I presume, the ‘mind over body’ and sports psychology discussion is only relevant assuming all athletes who are competing are more or less on par when it comes to playing skills.
We recently saw this in the epic match between Federer and Djokovic at Wimbledon finals where both the Legends had an equal chance of lifting the Wimbledon trophy.
Holding everything else constant, it becomes a mind game where the one who has mastered the mind techniques would gain an upper hand. And I think this applies to not just International high profile competitions but these techniques would also apply to grass-root level tournaments like inter-house matches in school, district level or any other local competition.