A mixture of back squats & breathing back squats. I'd personally go with dips, legs crossed behind you so you get that forward lean. Or you can go more Gironda style, legs out in front of you, chin on chest, go wide but not too wide! And if your delts can handle it go with nice presses, rep range 12-20, make sure your warmed up well.
With the squats I'd lean also towards the higher reps. NOTE: Work the **** out of you back, a bigger, stronger back will help you in building up your chest.
The breathing squat will build up your chest like nothing else. It's hard, but the harder the better results.
CORRECTION, hahaha, yah, try out the NICE presses. Meant to type....NECK presses. I really like this execise, but being a tennis pro and performing this exercise is not happening right now for me! Work your cuffs!