The women's field is historically fast with 9 - yes 9 - sub 2:18 women on the start list (the most in history before this was just 6). THe men's race will have huge implications for the Kenyan and Ethiopian Olympic teams. Might this be the swan song for Kenenisa Bekele?
We break it down for you here.
Who do you think will win? What will the winning times be? Vote in the polls in the article and then tell us why here.