Hippo, hands down. The teeth on an elephant seal are no match for the tusks on a hippo. read more
Elephant seal wins on land, walrus wins underwater. Both the northern and southern elephant seal are much larger than the walrus, and this would actually allow for them to have the mobility advantage in a land fight because they can rear up a lot higher. read more
Hell, I think a Saltwater Crocodile would win against a Northern or Southern Elephant Seal, let alone a hippo. You do realize Northern Elephant Seal's are on average 5,000 lbs, while the Southern Elephant Seal on average is 8,000 lbs. read more