Oh that Delpo forehand

Sometime late in the fourth set of Monday's grueling, mesmerizing, intoxicating and, yes, agonizing match between Dominic Thiem and Juan Martin del Potro, my wife walked in -- she had heard me screaming relentlessly for at least an hour -- and she asked me a question:

"Who are you rooting for, anyway?"

In a lifetime of watching sports, I have never not ha…