Originally Posted by schmke
Except that isn't the complete answer!
Yes, it sees you won 5 and the opponent won 9, that is the game differential of 4. But that isn't what it goes with. Because it wasn't a complete match and the computer likes to use complete matches, it assumes the rate at which both of you will continue to win games is the same and says this match has a game differential of 5.33 rather than 4.
Sometimes ya gotta do all the math
Here's an equation for you that just might blow your mind:
5.33 = 4.
-- Random Error Generator, Version 4.0
-- Master Moonballer