Hisashi Iwakuma moves ahead of Clayton Kershaw for best ERA among starters since last year

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Last year Hisashi Iwakuma spent the beginning of his rookie season mopping up for the Mariners, but the veteran right-hander from Japan thrived when given a chance to join the starting rotation and has quietly been one of the best pitchers in baseball since.

Lost in the craziness of yesterday’s 16-inning White Sox-Mariners marathon is that Iwakuma tossed eight shutout innings, making him 14-5 with a 2.31 ERA in 29 career starts in the majors. During that time he has a 157/41 K/BB ratio in 183 innings and has held opponents to a .220 batting average.

But wait, here’s the most impressive stat: Among all MLB pitchers at least 175 innings worth of starts since the beginning of last season Iwakuma’s 2.31 ERA as a member of the rotation is the best, followed by Clayton Kershaw at 2.35. No one else is below 2.65.

No one pounds the zone anymore

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“Work fast and throw strikes” has long been the top conventional wisdom for those preaching pitching success. The “work fast” part of that has increasingly gone by the wayside, however, as pitchers take more and more time to throw pitches in an effort to max out their effort and, thus, their velocity with each pitch.

Now, as Ben Lindbergh of The Ringer reports, the “throw strikes” part of it is going out of style too:

Pitchers are throwing fewer pitches inside the strike zone than ever previously recorded . . . A decade ago, more than half of all pitches ended up in the strike zone. Today, that rate has fallen below 47 percent.

There are a couple of reasons for this. Most notable among them, Lindbergh says, being pitchers’ increasing reliance on curves, sliders and splitters as primary pitches, with said pitches not being in the zone by design. Lindbergh doesn’t mention it, but I’d guess that an increased emphasis on catchers’ framing plays a role too, with teams increasingly selecting for catchers who can turn balls that are actually out of the zone into strikes. If you have one of those beasts, why bother throwing something directly over the plate?

There is an unintended downside to all of this: a lack of action. As Lindbergh notes — and as you’ve not doubt noticed while watching games — there are more walks and strikeouts, there is more weak contact from guys chasing bad pitches and, as a result, games and at bats are going longer.

As always, such insights are interesting. As is so often the case these days, however, such insights serve as an unpleasant reminder of why the on-field product is so unsatisfying in so many ways in recent years.