Tag Archives: Delta Graphs

Dayan Viciedo and the zone

My buddy John Gibson interviewed Dayan Viciedo of the Chunichi Dragons last week, which you can hear on the Japan Baseball Weekly Podcast.

In the interview, Viciedo, last year’s CL batting champion, said the difference between this season and last has been more balls out of the zone, demanding better plate discipline from him.

According to Delta Graphs, Viciedo has, so far this season, seen a slightly higher percentage of pitches in the zone than he did last season. He’s swinging at fewer of them, and swinging at a few more outside the zone.

His percentage of pitches in the zone this season so far is 41.9 percent, up from 40.6 last year, which was then a career high for him in Japan. This year, he’s swung at 32.6 percent of the pitches out of the zone, and 68.1% in the zone. Last year, those figures were 30.2% and 73.5%, respectively.

The real difference has been what happens when he puts the ball in play. We don’t have exit velocities and Delta Graphs categories the speed of balls of the bat as soft, medium and hard. But those percentages have barely moved this season for Viciedo.

The difference seems to simply that he’s being hurt by more balls in play being turned into outs than he did last season. Last season, his BABIP was .354, this year it’s .335.

I’m guessing that that is partly luck and — because his percent of home runs per fly ball is way down so far this year (to 13 percent after being over 16.8 percent in each of his first three seasons. This could easily be a function of the colder early season weather.

There’s no reason to think that those things he does in the batters box to hit pitches are any less effective than they were a year ago.

Strike while the iron is hot

While we’re on the subject of called balls and strikes in Nippon Professional Baseball, @Student_murmur has done a nice study in Delta Graphs about how the count affects umpires calls, which you can find in Japanese HERE.

Lacking pitch tracking data and having to depend on Mark I eyeball technology, the researcher drew a line around the strike zone in different counts where calls went 50-50. It’s no surprise that the smallest zone accompanies the 0-2 count, and the largest the 3-0 count.

The data from 2017 and 2018 collected by Delta Graphs looks fairly consistent and are consistent with the findings of John Walsh in 2010, which you can find HERE. Walsh found that the area of the strike zone’s vertical plane in MLB was 3.52 square feet with a 3-0 count and 2.42 square feet with an 0-2 count.

The last post here dealt with pitch locations derived from Nikkan Sports’ pitch-by-pitch data in 2018. These consisted of designated as inside the edge of the zone and outside the edge. I labeled them all borderline pitches, either borderline ball locations or borderline strike locations.

Looking at pitches in these two border zones that were called balls and strikes on 3-0, 0-2 and all other counts in 2018 produces the following tables, where 78 percent of all borderline pitches were called balls in counts other than 3-0 and 0-2. In 3-0 counts it was 60 percent. In 0-2 counts it was 92 percent.

We need to understand that in this study and the Delta Graphs one, the data points are being observed by someone else’s eyeballs and recorded by someone else’s hands. Also, pitchers can worry less about balls and strikes in certain counts. Unfortunately, the same seems to go for umpires.

Borderline called NPB balls and strikes in 2018 with 0-2 counts

CountBorder ZoneBallStrikeTotal
0-2Strike Zone1182183
0-2Ball Zone2,12242,126
0-2Total2,1231862,309
Percent91.94%8.06%

Borderline called NPB balls and strikes in 2018 with 3-0 counts

CountBorder ZoneBallStrikeTotal
3-0Strike Zone0349349
3-0Ball Zone5243527
3-0Total524352876
Percent59.82%40.18%

Borderline called NPB balls and strikes in 2018 with all other counts

CountBorder ZoneBallStrikeTotal
OtherStrike Zone211,06011,062
OtherBall Zone39,50413539,639
OtherTotal39,50611,19550,701
Percent77.92%22.08%