Dad Had a Bad Day by Ashton Politanoff

Since losing his job, Ned's sole responsibility has been to look after his six-year-old son while his wife works. When he one day finds his old tennis racquet buried in the garage, he also unearths a part of his former self.

On a whim, and without his wife's knowledge, Ned re-joins his former tennis club - and finds life outside the realm of domesticity. He becomes the captain of a local men's team, reconnects with his old partner, former tennis-prodigy Roland, and commits himself body and soul to building a winning team. But when Roland disappears, Ned's search for his friend threatens not only the path to glory, but his relationship with his son, his marriage, and his mind.