Will win/should win:
Chadwick Boseman
"Ma Rainey's Black Bottom"
Role: Levee, a mercurial musician who refuses to accept the limitations society hands him.
In his favor: He's extraordinary in the film (and its real star). He has run the table in preliminary awards. He made "Rainey" while ill with cancer, telling no one. This is the last chance to honor a stunning talent.
Then again: Even Tom Hanks couldn't break into this strong field. It's easy to imagine any of them winning.
The rest
Riz Ahmed
"Sound of Metal"
Role: Rock drummer Ruben, who refuses to accept that his hearing is shot.
In his favor: Ahmed dominates the movie, with most of "Metal" taking place in Ruben's head. It's an intensely vulnerable part and the actor, whose peers gave him an Emmy for "The Night Of," aces it.