That's 75 total games (which makes sense since there are 30 teams, meaning 15 Opening Day games per year, times 5 years.)

Just out of curiosity, how did you handle the 2008 season? Atlanta opened with that bizarre one game series at Washington, then those two teams went on to play the Pirates and Phillies respectively on the true "Opening Day". Seems to me you would almost have to count 16 games as "openers" that year given that quirk, or just 14 if you struck the two games where the Braves and Nats were actually playing their second game of the season....

]]>...

...

And then I realized that these events aren't exactly independent. In fact, they are very very highly correlated.

Yet another lesson in intuitive statistics.

]]>1) because I would also guess starting pitchers are going to pitch less innings during their first few starts than later in the season - and less innings = more no decisions

2) Opening Day typically has the "Ace" for both teams which could result in more pitching duels which again could result in more no decisions. ]]>

I was talking to my wife last night just as a finished the post and must have forgotten to actually type that in.

]]>9.1% of games with one of each?

]]>