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You might have hit the nail on the head Tony. Could be , and just guessing , that his coaches have seen is super negative body language after losing points and have pushed him to yell when he wins , a case of trying to straighten the dog's tail
It has nothing to do with fatigue
When he wins points, he yells
when he doesn't win points, he is very very very very very quiet with a very very very very negative body language/expression (this got to do with his age)
He also doesn't yell after winning game point or match point, so to me, his yelling is more tactical than oppose to emotional as most players will yell after securing game or match point