Girls, Is a sports bra a good idea?

Ok, so here is the deal. As the weather has gotten warmer, I am excited about playing Beach Volleyball where I can obviously wear my swimsuit. In the meantime, I have been playing tennis. The other day I made the mistake (and it was a mistake of) of wearing a regular bra to play tennis. Ouch!!! Never again. I need to get a good sports bra. Where is a good place in the US to get one? Shall I wear the same size as a regular bra? I am a 34DDD in a regular bra. Is there a sports bra that you would recommend perhaps? Do I need to get refitted. I am assume that I will certainly need to try them on. Help me please. Thanks.

Girls, Is a sports bra a good idea?
Post Opinion