Most likely, a shark.
However, Great White Sharks are believed to dislike the taste of human meat.
(That doesn't mean you should jump in the ocean and find out yourself.)
A great white shark would win in a battle vs. a human. The reason being, if coming to the fight only equipped with what they were born with, a shark has more teeth, larger jaws. A human couldn't compete with that bare-handed.
the shark would win unless its a large jelly species.
a tiger would win
the great white shark will win
A shark
tiger shark
Mostly the Tiger shark would win. Most species of hammer heads are smaller than the tiger shark and hence would lose.
The Panther would win because the shark would run out of air and would die, then the panther would eat it.
shark
shark
shark
a shark