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 +36.8
+0.6
River Plate 1 Olmedo 1 -12.3
-0.2
Week of 5/10None
Points
Chance Will Make Playoffs