How are these numbers calculated?

Big Games

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

Week of 3/25None
Week of 4/1100.0*Chance in playoffs100.0*Average seed
Universidad de Chile 0 Cruzeiro 2 +31.3
+0.4
Real Garcilaso 0 Defensor Sporting 2 -2.9
-0.0
Week of 4/8100.0*Chance in playoffs100.0*Average seed
Cruzeiro 3 Real Garcilaso 0 +33.5
+0.3
Defensor Sporting 1 Universidad de Chile 1 +2.8
+0.0
Points
Chance Will Make Playoffs