I use the foam roller all over prior to matches to sort of "wake up" my muscles.
In between matches I use the foam roller to break up muscle spasms and knots if I can tolerate holding the roller into those knots. If not, I'll just roll over the spasms like a massage.
Works everywhere....legs, lats, arms....I can use the roller horizontally up and down over my back and I'll almost always self mobilize myself.
I'll lie over the roller on my back vertically and stretch my pecs and torso and arms.
Can be pretty tender in some spots, so be careful. There's plenty of videos on Youtube on how to use a foam roller.
Babolat APD/RPM Blast 18G @ 53#.