A very simple, straight-forward short novel, with an unrealistic plot which provides a happily ever after ending. I read it for the tennis. It's hard to work tennis into a narrative, and hard to capture the tension and excitement of a tennis match in prose. Even an enthusiastic tennis fan (me!) might not enjoy reading about a tennis match.
Luckily in this short book, most of the tension is not about tennis itself.
I try not to judge hi-low books too harshly. I'm sure "reluctant readers" would enjoy this.