I agree with everything Alistair said. S and S is perfect, and ROP would be awesome in the off season, otherwise the volume and snatches could pose some shoulder trouble.
I've tried to get my dad on S and S in the past year or two, but he hasn't jumped on it. He's been playing tennis for almost 50 years. Played in college and routinely plays with guys half his age. Thankfully he did take to the kettlebells a few years ago. I think he hasn't tried S and S because he likes the first set up I gave him. It's just an easy strength approach with goblet squats, clean and presses (usually 3 ladders of 2, 3, 5 or 1, 2, 3, 4), swings and pullups (he uses one of the machines that makes him a little lighter, but he loves the neutral grip pull ups). He's been injury free since he started, and he used to often have nagging upper neck issues and semi-frequent adductor strains. So maybe it's the bells?
Still, I think S and S is the absolute best route to go. It covers everything.