CHICAGO (AP) — It's Andrija Prlainovic and Serbia on the men's side, and Maggie Steffens and the U.S. for the women's tournament.
The rest is pretty murky.
The defending world water polo champions are the big favorites for the Rio Olympics, but the top challengers to each country are unclear.
"I think Serbia right now is the favorite and I think everyone else is about even," U.S. men's captain Tony Azevedo said. "The Olympics is a funny tournament where it's one game a lot of times. So you could start off bad and then end strong, or start off great and end terrible.