How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/14None
Week of 4/21100.0*Chance in playoffs100.0*Average seed
Universidad San Martin 1 Nacional 1 In
Week of 4/28100.0*Chance in playoffs100.0*Average seed
Nacional 3 Nacional-PAR 1 +0.1
River Plate 3 Universidad San Martin 0 +0.1
Chance Will Make Playoffs