Are we supposed to ignore the Orioles’ run differential?

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The Orioles have allowed far more runs than they’ve scored this year. In fact, they’ve allowed 44 more runs than they’ve scored, which has led many — myself included — to believe that they’ve out-performed their talent level this season and are due for a downward correction. Their actual record: 51-44. The record a team with their run-differential would be expected to have: 43-52. Something’s gotta give eventually, right?

Ken Rosenthal’s latest column has a part dealing with all of that and he says that it’s not a big deal, and even goes so far as to call the run differential thing a “myth”:

Some sabermetricians view that statistic as evidence that the Orioles will falter, but club officials see it differently. In their view, the Orioles’ run differential is easily explained.

First, the team’s inconsistent starting pitching produces an unusual number of blowouts. A mere seven games — two 12-run losses, one 11-run loss and four seven-run losses — account for a whopping minus-63.

The Orioles’ terrific bullpen, on the other hand, enables the club to win an inordinate number of close games — the O’s are 10-2 in extra innings and 19-6 in one-run outcomes.

Well, sure, that explains it. But it doesn’t in any way establish that their out-performing their run differential is sustainable. And that’s the key point that “some sabermetricians” would make.

Yes, the Orioles have erratic starting pitching that is prone to blowouts. But that’s no point in favor of the Orioles being better than they look. Usually teams with that kind of starting pitching have crappy records. Yes, they have been extremely fortunate in one-run games, but even teams with the greatest bullpens don’t see that level of success in close games over the long haul.

Would it be impossible for the Orioles to continue to out-perform their run differential all season? Of course not.  But thousands of team-seasons have been recorded since statistics have been kept, and it is pretty rare for any team to out-perform their run differential on the order that the Orioles are doing it at the moment for an entire season.  The Orioles are eight games ahead of their expected record. About a dozen or so teams have out-performed their expected record by ten games or more. Run differential analysis being on-point is far less of a mythological thing than a team behaving for 162 games like the Orioles have behaved for 95 is.

A good bullpen and erratic starting pitching may be skewing things at the moment. But it cannot be denied that if the O’s were to keep things up the way they currently are, it would be a historical exception, not the rule.

In the playoffs, the Yankees’ weakness has become their strength

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Two weeks ago, when the playoffs began, the idea of “bullpenning” once again surfaced, this time with the Yankees as a focus. Because their starting pitching was believed to be a weakness — they had no obvious ace like a Dallas Keuchel or Corey Kluber — and their bullpen was a major strength, the idea of chaining relievers together starting from the first inning gained traction. The likes of Luis Severino, who struggled mightily in the AL Wild Card game, or Masahiro Tanaka (4.79 regular season ERA) couldn’t be relied upon in the postseason, the thought went.

That idea is no longer necessary for the Yankees because the starting rotation has become the club’s greatest strength. Tanaka fired seven shutout innings to help push the Yankees ahead of the Astros in the ALCS, three games to two. They are now one win away from reaching the World Series for the first time since 2009.

It hasn’t just been Tanaka. Since Game 3 of the ALDS, Yankees pitchers have made eight starts spanning 46 1/3 innings. They have allowed 10 runs (nine earned) on 25 hits and 12 walks with 45 strikeouts. That’s a 1.75 ERA with an 8.74 K/9 and 2.33 BB/9. In five of those eight starts, the starter went at least six innings, which has helped preserve the freshness and longevity of the bullpen.

Here’s the full list of performances for Yankee starters this postseason:

Game Starter IP H R ER BB SO HR
AL WC Luis Severino 1/3 4 3 3 1 0 2
ALDS 1 Sonny Gray 3 1/3 3 3 3 4 2 1
ALDS 2 CC Sabathia 5 1/3 3 4 2 3 5 0
ALDS 3 Masahiro Tanaka 7 3 0 0 1 7 0
ALDS 4 Luis Severino 7 4 3 3 1 9 2
ALDS 5 CC Sabathia 4 1/3 5 2 2 0 9 0
ALCS 1 Masahiro Tanaka 6 4 2 2 1 3 0
ALCS 2 Luis Severino 4 2 1 1 2 0 1
ALCS 3 CC Sabathia 6 3 0 0 4 5 0
ALCS 4 Sonny Gray 5 1 2 1 2 4 0
ALCS 5 Masahiro Tanaka 7 3 0 0 1 8 0
TOTAL 55 1/3 35 20 17 20 52 6

In particular, if you hone in on the ALCS starts specifically, Yankee starters have pitched 28 innings, allowing five runs (four earned) on 13 hits and 10 walks with 20 strikeouts. That’s a 1.61 ERA.

While the Yankees’ biggest weakness has become a strength, the Astros’ biggest weakness — the bullpen — has become an even bigger weakness. This is why the Yankees, who won 10 fewer games than the Astros during the regular season, are one win away from reaching the World Series and the Astros are not.