(Should have crossposted this when I posted it to ~Stacker_Sports , but forgot; my bad.)
Lots of fun statistics on opening days in MLB. More about correlation than causation, but there's some fun stuff:
When teams won the first game of the season over the past decade, they’ve gone on to have a winning season about 60 percent of the time. When they lose the first game, that frequency drops below 40 percent.
Great data visualization, too.