Pitching: Here, There, Everywhere

» 20 December 2013 » In mlb, mlb prospects, npb »

Every time an NPB pitcher transitions to MLB, we see a number of projectsions for he might perform statistically. For me these projections are always a bit of a shot in the dark — there is just too much variance among too many factors to make a linear statistical project realistic.

The big, obvious difference for pitchers is simply that MLB hitters are better than NPB hitters. The best MLB hitters are better than the best NPB hitters, and the average MLB hitter is better than the average NPB hitter. But beyond that, there are a number of more subtle factors that make projections difficult. Here are the ones I can think of, from the perspective of NPB:

  • There are fewer legitimate power threats in Japan. Every lineup has at least couple of regulars who just don’t hit home runs.
  • On the other hand, there are rather few strikeout machines like Adam Dunn and Pedro Alvarez.
  • Japanese managers are still in the habit of regularly throwing away outs with sacrifice bunts.
  • Most Japanese ballparks have massive foul ground.
  • The NPB ball is slightly smaller and lighter than the MLB ball. I’ve also heard that it is a bit tackier than the MLB ball and easier for some pitchers to command.
  • Japanese starters, at least the good ones, go a bit deeper into games. 120 pitch starts are on the high end in MLB, but are not uncommon in Japan. Yu Darvish was no stranger to pitch counts in the 140’s in his NPB days.
  • NPB starters normally get six days between starts, which includes a weekly off day. Pitchers sometimes get in a rhythme of pitching on the same day each week. The most famous example of this was Lotte ace Choji Murata, who was nicknamed “Sunday Choji”.
  • NPB starters also stay home the day before their scheduled starts.
  • Playing in Japan requires less travel. All of Japan is in one time zone, and five of the 12 NPB teams are based in the vicinity of Tokyo.
  • NPB has 12 teams total, six in each league. Normally a starter will face each team in the opposite league once during interlegue play, and see the other five teams in his own league four of five times each. Most MLB starters will see a bigger variesty of lineups.

Stats are good, they just need to get filtered through all this stuff, plus whatever else I didn’t think to include. Ultimately the conclusion I’ve arrived at is that skills are translatable, but stats less so.

Tags: ,

Trackback URL

  1. Patrick
    Umpire
    20/12/2013 at 1:43 pm Permalink

    Great wright up! The NPB fascinates me.

  2. Patrick
    iyasu
    22/12/2013 at 8:21 pm Permalink

    Great points. To add to the one about ballparks, aren’t about half of them domed stadiums, and an even higher percentage use artificial turf?

  3. Patrick
    Jim Allen
    22/12/2013 at 10:41 pm Permalink

    Nice summary. I agree that the massive number of contextual differences makes adjustment very tricky going both ways across the Pacific.

    Saying about MLB’s best hitters being better than NPB’s best is intriguing and generally true, because they have to face tougher competition to get there and the size of MLB’s talent pool is vastly larger. The big gap in talent, I believe, is not at the top but the bottom, where a number of NPB regulars would struggle in Double-A.

    I don’t think NPB pitchers routinely stay home before a start. They are rarely on the bench as NPB has a 28-man active roster and only 25 can be in the game, so 3 starters getting ready to pitch their next starts leave the field after practice.

  4. Patrick
    Patrick
    23/12/2013 at 12:58 am Permalink

    Saying about MLB’s best hitters being better than NPB’s best is intriguing and generally true, because they have to face tougher competition to get there and the size of MLB’s talent pool is vastly larger. The big gap in talent, I believe, is not at the top but the bottom, where a number of NPB regulars would struggle in Double-A.

    Well, I think it’s both. The top hitters in Japan are MLB-caliber, but not as good as the top guys in MLB. And depth is certainly a lot weaker in NPB than in MLB.

    I don’t think NPB pitchers routinely stay home before a start. They are rarely on the bench as NPB has a 28-man active roster and only 25 can be in the game, so 3 starters getting ready to pitch their next starts leave the field after practice.

    This I something I heard second hand. I guess I should update the post.

  5. Patrick
    Muratafan
    25/12/2013 at 4:22 am Permalink

    Another factor is size of the ballpark. Hideki Matsui played in the Tokyo Dome wherein hitting a home run is REALLY easy and Kuroda played in the old Hiroshima stadium which was simply a bandbox. Kuroda then went to cavernous Dodger stadium and that can have a huge impact on ERA.

    The most recent NPB pitchers have fared quite well: Darvish, Iwakuma and Kuroda. I think the biggest factor in translating success from NPB to MLB is the walks/9 innings. NPB has a bigger strike zone and if an NPB pitcher issued a lot of walk in NPB, they’ll issue even more in MLB. Kaz Ishii and Dice-K are classic examples. Neither had really miniscule walks/9 innings and I think that spelled lack of success in MLB.