Tanking, throwing temper tantrums, and generally make an A-hole of yourself are defense mechanism. You don't want to lose so you pee-pee all over yourself publicly rather than lose with touch of dignity. My advice is to grow the F up. Your tennis match is not all that important. Someone's first child is important. A family member or close friend getting cancer is important. Your tennis match, even your university tennis match is not important.
If you cannot figure out a way to play with some degree of maturity, just stop playing so you don't ruin it for the rest of us.