I recently researched the numbers on beating the same team 3 times in same season since it is very possible we will play Falcons 3 times this season since Lions won this week and should win next week with Packers resting starters.
Here it is, 19 times since 1970 have teams faced each other 3 times in same season. 3 wins has happened 12 times out of 19 possible. That's a 70.5% chance for 3rd win after two wins in same season. The last time it happened was just 2 years ago with Steelers beating Ravens 3 times.
The theory behind numbers is that the reason one team beats the other twice in regulars season is because it's the better team and this is why such a high rate of 70.5% to get 3rd win.