I've been watching the live feed of the ITA Indoor Championships online all night and there's some kid playing right now who serves left handed and then switches hands to play his ground/volley game with his right hand dominating. I've never seen that before. I guess at some point he figured that nobody likes to return lefty serves and then maybe it sets up his righty forehand better or something.
I'm not sure what team he plays for. He's wearing light yellow team colors, playing against what I think is Alabama in red.
EDIT: Btw here's the site if anyone wants to watch it.