Matt Damon in The Martian is an acting performance of Matt Damon in the movie The Martian. Damon played a role of a fictional American astronaut, Mark Watney. More: en.wikipedia.org.
Tom Hanks in The Green Mile
Brie Larson in Room
Steve Carell in Foxcatcher
Saoirse Ronan in Brooklyn
Michael Keaton in Birdman
Eddie Redmayne in The Theory of Everything
Eddie Redmayne in The Danish Girl
Jennifer Lawrence in Joy
Who should win the 2016 Oscar for Best Actress in a Leading Role?
Charlotte Rampling in 45 Years