He lost it because of not controlling his mind. Golfers should do good physical exercise and at the same time improve the mental toughness by practicing Yoga. One can see how he lost control of hmself.
This game is unbelievable .... he was -13 till 67 holes of the tournament, leading the tournament .... and then he drops 4 shots in 5 holes... If he had won ... his European tour card would have been confirmed... :-(