How are these numbers calculated?

Big Games

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

Week of 4/10100.0*Chance in playoffs100.0*Average seed
Cucuta Deportivo 3 Gremio 1 -22.1
Cerro Porteno 1 Deportes Tolima 0 -6.4
Week of 4/18None
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Gremio 1 Cerro Porteno 0 In
Deportes Tolima 3 Cucuta Deportivo 4 +0.0
Chance Will Make Playoffs