Baseball-Dad--My son plays in Metro 3A so I think I have a decent sense of that league.
O'Dea is the defending conference champ and looks very good. Perenially strong players in Metro 3A are Eastside Catholic, Bainbridge Island, Blanchett, Seattle Prep. Lakeside, West Seattle and Nathan Hale each have one of the area's best 2016's. Roosevelt is well coached, as is Garfield, and the latter has one of the better 2017s in the conference. Ballard's best starter is back, but that team lost some seniors at key spots. Sealth, Rainier Beach, and Cleveland will have game teams but hard seasons.
O'Dea is a younger team, especially the pitching, but all of those younger arms had varsity innings last year (not common at O'Dea). Senior returners are few but include the first team all-league CF, who is their captain, and pictured homering in the playoffs in my avatar.