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
Nacional-PAR 4 River Plate 2 In
Universidad San Martin 1 Nacional 1 +7.4
Week of 4/28100.0*Chance in playoffs100.0*Average seed
Nacional 3 Nacional-PAR 1 -0.0
Chance Will Make Playoffs