From DR. BOLI’S ALPHABET OF OCCUPATIONS.

T is for the Tennis Star.
No matter what you do or are,
Your job is more enjoyable by far
Than being just a plain old tennis star.
His work is dull monotony in the extreme;
His duties no more complicated than they seem:
He whacks the ball hard as he can across the court, and then,
As soon as it comes back to him, he whacks the ball again.
And yet his job is necessary, though it seems there’s nothing to it:
For if he didn’t hit the ball, some other fool would have to do it.