A friend of mine (NTPR 5.0) has a very good serve and volley style. During many years he was using a Hammer version (not remember which one) but he wants to change it. The reason es because he´s having some problems in his shoulder and needs something more comfortable. He´s 45 yrs old and has an excellent physical condition. Could you help me to recommend him a good substitute? What is he looking? -Suitable for his serve & volley style (KEY FACTOR) -Shoulder friendly racquet Preferred brands in relevance order: 1) Wilson; 2)Babolat; 3)Prince.