Does anything prey on great white sharks?

Actually, Orcas (Killer Whales) are known for killing and eating Great White Sharks.

Orcas kill Great whites by flipping them on there back, sharks go into a trance on it's back, the Orca will keep it there until it drowns, but will only eat it's liver.
great white sharks do NOT have any NATURAL predators, but man is considered a predator of great white sharks