Maybe its a Mediterranean influence, where they feel it's good to let your emotions out rather than hold them in, but I've been criticised for being too extroverted on the court.
On one hand, simple exuberance and having fun should be okay if it doesn't go over the top.
On the other hand, this is what happened the other day. As a net player, I blew 3 put-away overheads in the same game by inches, which buried my partner's service game. After the third one I leaned against a wall in mock anguish.
How do the greats maintain their composure on court, amidst all the drama?
I remember seeing 19-year-old Federer against Sampras at Wimbledon. When he made a mistake, all he betrayed was a slight, momentary tensing and an exhale.
I suppose that in practical terms, it's all about turning the page to be ready for the next point, and that investing extra emotion drains your energy reserves.