Well all workouts should be ballenced and "whole", meaining you dont just focus on one area. so...
you need to follow a good all round compound program.
Squat, lunges, deadlifts, chest press, shoulder press, pull ups, bent rows, crunches, woodchoppers.
you may also want to add some side to side lunges.
keep your weight high and your reps low, this will help your explosive power. If you are doing over 10 reps then you'll just be adding to your muscle size without the strength gans.
The problem with tennis is that you can suffer from the repetative motions, this is because you use the same hand to lead all the time. So be careful. If you start getting any pain in your leading shoulder, take a week or to off. the worst thing you can do is try and play with a broken body because it will just get worse.
