The MLB wild card used to be a simple thing. There was one in each league, and the only time we had to worry about play-in games was in years when things got weird.
Now there are two wild cards in each league, and there's going to be a wild-card play-in game every year until further notice. Things will be weird right up until the moment all of us get used to the new format, and that may take a while.
Complicating matters is the fact that the presence of the extra wild cards has given rise to a few extra contenders in each league. There are presently 10 legit wild-card contenders, five in each league. The list of potential wild-card matchups is endless (or seemingly endless, anyway).
But if I had to hazard a few educated guesses, I'd say that there are five matchups in each league that are more likely to happen than all the others.
Starting in the American League, here's a quick look at each of those 10 potential matchups.
Note: All stats come from Baseball-Reference.com unless otherwise noted.