How are these numbers calculated?

Big Games

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

Week of 4/26None
Week of 5/3100.0*Chance in playoffs100.0*Average seed
Junior Barranquilla 3 Nacional 2 +40.7
+0.7
River Plate 1 Olmedo 1 -3.2
-0.1
Week of 5/10None
Points
Chance Will Make Playoffs