I am a new member. am playing tennis at Junior level. I hope this site will be of immense help in improving my tennis skills. Let me start with my service. I practiced my service with a forehand grip and I was comfortable with that grip. But now my coach asks me to shift to hammer grip, which I am not finding it comfortable. Please enlighten me about the disadvantages of having a forehand grip service action and it's implications on speed, direction and possible injuries in future? Can I continue with the grip I am comfortable with?