There have been 37 World Series Game 7s, but most (20) came in that 36-year sweetspot between 1955 and 1991. During that time, more than half of World Series played (55%) went to Game 7.

Before 1955? There'd been 12 in 51 years, so less than a quarter (23%) went to Game 7.

Since 1991? Five in 23 years, or 22%.

I've been alive for 19 of them and have probably watched a dozen. I'll be watching tonight, rooting for the Royals. 

Certain odds are in their favor. The last time the visiting team lost Game 6 (which would've given them the title) and then won Game 7 (which did) was the Big Red Machine in '75—after Fisk's homerun at Fenway in Game 6. Devastating loss but the Machine didn't care. It kept on going, right into the next year, when it swept both a good Phillies team in the NLCS and a noisy, Billy Martin-led Yankees squad in the World Series.

Game 7s, in general, tend to be won by the home team, but this appears to be a recent phenomenon:

Anyway, I'm glad it's here. Nothing like a Game 7. But go Royals. 

More of this tonight? Recent history says yes, the San Francisco Giants and their fans say no.