Mental aspect in boxing

Fighter is in shape when he is mentally and physically prepared.In boxing mentally is more important,why?For example when fighter is in great shape.he running great,he spares 10 rounds without tiring he doe's everything great in training preparation.And than in fight he gassed out in two rounds.Maybe he get scared,maybe he forgot bread or become to excited or too tense.These factors are mentally factors.In some interview famous trainer Kevin Rooney said that boxing is 80% mentally and 20% physically.It was interview about Mike Tyson fight with Kevin McBride.He said that Tyson wasn't too old,tat he had tools to be world champion again but he just didn't had his mind in boxing.George Foreman became heavyweight champion in his mind he believe in himself and what is very important he never get tired in his second career when he was old and overweight.He was relaxed and mentally stable.Before fight there is mentally games between boxers.In many situations boxer win before fight started.Mike Tyson won many fights that way because his opponents was too scared from him.Earnie Shavers describes in his book how he played mentally games in prefight conference.He always said something to his opponents in that way that opponent start worries about his words till the fight.Archie Moore said that he liked to watch opponent in his eyes before fight to break him mentally.There are many more examples.Also good boxing trainers knows how motivate their fighters.There is special kind of energy between fighter and trainer.I know from my own case when is somebody in your corner who truly believe in you you can be winner and sometimes if the wrong person are in your corner you can lose fight from worse fighter.At the end we came to conclusion that mentally is even more important than phisically.Of course this doesn't mean that you don't have to train hard for the fight.You must give all your best in training and be strong mentally.This are  the qualities of great fighters.