I agree it's something he needs to keep working on - but realistically I doubt it's something he will ever eradicate.
Then he will never reach his true potential. Unless Murray is a McEnroe type, where the tantrums bring out his best, but that is hardly the case here. He's got the game to win multiple slams, but how many has he already lost due to his inferior mentality?
He's a moody sort of player who needs to let his frustrations out sometimes, whether it gives his opponent a boost or not.
Eh? If it gives the opponent a boost, as it clearly did today, and clearly does whenever he plays the big boys in the slams, why should he continue to do it? Does he WANT to lose? Federer and Borg both cleaned up their act mentally on court. If Murray wants to be mentioned in the same echelon with those guys, or even close, he has to clean this up.
Most of the time, for all the fuss that gets made, I doubt it makes any difference at all. Did it give Raonic a bit of a boost at times today? Maybe, maybe not. Andy will be Andy. Those of us who are fans find it frustrating too but you take the good with the bad.
Perhaps vs. the lower ranked players, it doesn't. But against the best guys I guarantee you it does. Guarantee. And more, now that Raonic has another big win over Murray, on a hard court this time, his mentality vs. the guy in all future matches is different. Now Raonic has a solid win over Murray, and mentally he can use that going forward, especially in the slams. No way he gets beat 4, 4, and 2 if they play at the AO. These events are not big in terms of historical significance, but in terms of getting mental edges here and there going into the AO, these events are very important.