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Entering play last night, the American League was 148-133 in interleague games this season. (Those figures don’t reflect last night’s Rangers-Braves game.) Since each team plays 20 games against teams in the other league, that means with just three more wins the American League will clinch the interleague series for the 14th straight year. Here’s the record:

(The last dot is entering play last night.) The interleague play record is the strongest indicator available that the American League is the better of the two leagues. The decline in the American League’s dominance is the strongest indicator available that the National League is catching up. And this isn’t an original thought. Rob Arthur wrote about it at FiveThirtyEight.

There’s a theory that the American League has a built-in advantage in interleague play, since its rosters include designated hitters who are used in games played in American League ballparks, but as I demonstrated last month, designated hitters are below-average hitters this year. So it’s pretty tough to question the American League’s superiority on any basis other than talent.

Interleague play, though, is controversial. It muddles the two leagues in the one American sport in which the two leagues were truly separate entities. The DH conundrum creates the spectacle of pitchers who may have never batted in their professional careers being called upon to hit. It takes away games that teams play with teams in their own league and division. It makes travel schedules ever more complex. And interleague games are unbalanced. This creates an advantage for some teams relative to others. The imbalance comes from two sources.

First, there are the games against teams' designated divisional opponents. Every year, teams in a given division play teams in another division in the other league. For example, this year the National League West teams play the American League Central teams. Here’s how that will play out for the NL West clubs:

  • Arizona: 3 Chicago, 3 Cleveland, 4 Detroit (2 home, 2 away), 3 at Kansas City, 3 at Minnesota
  • Colorado: 3 Chicago, 4 Cleveland (2 home, 2 away), 3 Detroit, 3 at Kansas City, 3 at Minnesota
  • Los Angeles: 4 Chicago (2 home, 2 away), 3 at Cleveland, 3 at Detroit, 3 Kansas City, 3 Minnesota
  • San Diego: 3 at Chicago, 3 at Cleveland, 3 Detroit, 3 Kansas City, 4 Minnesota (2 home, 2 away)
  • San Francisco: 3 at Chicago, 3 Cleveland, 3 at Detroit, 4 Kansas City (2 home, 2 away), 3 Minnesota

Yeah, everybody plays 16 games against the AL Central. But nobody plays the same schedule. The Rockies have to play four games against the best team in the division, and six on the road against the second- and third-best teams. By contrast, the Giants have only six games against the two AL Central teams with a winning record, all at home, and their road games are against two of the worst teams in the American League.

Granted, that doesn’t create a competitive advantage for a bad San Francisco team, but Colorado is in a fight for the second Wild Card. Being one of only two National League teams to have to play four games against Cleveland (more on that later) and playing six road games against competitive Twins and Royals clubs makes their path harder than several other teams. Not a lot harder, but one game can make a difference.

And the same goes for the AL Central. The Twins play four games against a weak Padres team and get the competitive Rockies and Diamondbacks at Target Field. Playing against the stars-and-scrubs NL West, that’s a pretty favorable lineup.

Plus, in the postseason home-field advantage, first-round draws, and Wild Card teams are awarded based on records across the entire league, not just within a division. This puts teams in the American League West, whose interleague opponents this year are the one-trick-pony National League East, on stronger footing than other American League teams, just as the National League Central teams, facing the American League East buzzsaw, have a tougher go of it than other NL Wild Card contenders.

What’s the solution? There isn’t one. You can’t make interleague games balanced in terms of both opponents and home/road split without completely breaking down the league barriers.

Second, there’s the issue of “natural rivals.” Each team plays its natural rival in the other league four times, two games at home and two on the road. There are two groups of natural rivals. Some of them make sense, Some, well …

The Geographic Rivals: Brewers-Twins, Cardinals-Royals, Cubs-White Sox, Dodgers-Angels, Giants-A’s, Marlins-Rays, Mets-Yankees, Nationals-Orioles, Reds-Indians.

Some of those rivalries are more contrived than others, but OK, I see the logic. But that doesn’t make them fair. The Brewers, trailing the Cubs by 3.5 games in the National League Central after Tuesday’s games, drew a much tougher natural rival this year. The Yankees are battling for both a divisional crown and the Wild Card, and they got to beat up on a weak Mets team.

Wut: Braves-Blue Jays, Diamondbacks-Astros, Padres-Rangers, Phillies-Red Sox, Pirates-Tigers, Rockies-Mariners.

I get Braves-Blue Jays, since it’s a perpetual rematch of the 1992 World Series. But Pirates-Tigers? Because the hard feelings over the 1909 Honus Wagner/Ty Cobb World Series have never died? Phillies-Red Sox, commemorating all the years they were the worst teams in their leagues? Do the Rockies play the Mariners and Diamondbacks play the Astros to celebrate their shared legacies as expansion teams?

Irrationality aside, playing Colorado is tougher for the Wild Card-contending Mariners than the Rangers’ four games against the Padres. And while I noted above that the Yankees got an easy draw against the Mets, the Red Sox got an easier one.

Granted, not all of these series have gone as they’d appear on paper. The Yankees swept the Mets, but the Red Sox were “only” 3-1 against the Phillies. The Mariners did as well against the Rockies as the Rangers did against the Padres. Colorado took three of four from Cleveland. But Milwaukee got swept by the Twins, and the Twins’ 11-7 interleague record to date is three games better than that of the Angels, who were just half a game ahead of Minnesota for the second Wild Card as of Wednesday morning.

In short, the American League is going to win the interleague series, indicating its continuing superiority, though that superiority appears to be fading. That aside, interleague play remains imbalanced, and as such, creates scheduling advantages for some teams and disadvantages for others. After 20 years, we should get used to it. It’s not going away.

*By the time you read this, it’ll still be five (if Atlanta won last night’s game against Texas) or three (if Texas won). And yes, I know that an odd-numbered magic number is impossible in interleague play, where every win is matched by a loss. But it’s technically correct.