Maybe this is why there aren't many Great Whites around here. Old article:

http://www.cnn.com/EARTH/9710/08/whale.vs.shark/

i never new of orcas to do that. i would think that the shark would win a battle like that. that would be something to see while out fishing.

That would be impressive to witness, though it might be a little more interesting if it were a 25ft bull orca vs. 16-18-20 ft gw. My money would be on the orca.