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Carlos Gomez and plate discipline

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Carlos Gomez' walk rate has increased. Do the data support a sustainable increase?

Not swinging at these kinds of pitches helps.
Not swinging at these kinds of pitches helps.
Benny Sieu-USA TODAY Sports

Carlos Gomez is a good baseball player. He had a breakout 2013 campaign in which he garnered 7.6 fWAR through being good at EVERYTHING. Or, at least, mostly everything. The one knock on his game has been a lack of plate discipline, exemplified by his 6.3% walk rate and 24.7% strikeout rate last year. This year, it appears that he might have added a new tool—Gomez is sporting a 9.1% walk rate and a shiny .369 OBP, both by far the highest of his career.

Looking at his plate discipline numbers is somewhat revealing on how he has achieved the new walk rate. FanGraphs contains two sections on plate discipline numbers—one based on Baseball Info Systems (BIS) data, the other on PITCHf/x data—and they disagree on a few things.

Metric 2013 BIS 2014 BIS Difference
O-Swing% 37.8% 36.0% -1.8%
Z-Swing% 78.4% 79.4% 1.0%
Swing% 56.1% 54.4% -1.7%
O-Contact% 58.3% 52.6% -5.7%
Z-Contact% 83.4% 81.9% -1.5%
Contact% 74.1% 70.8% -3.3%
Zone% 44.9% 42.4% -2.5%

Metric 2013 PITCHf/x 2014 PITCHf/x Difference
O-Swing% 36.5% 37.5% 1.0%
Z-Swing% 76.0% 78.0% 2.0%
Swing% 54.7% 54.0% -0.7%
O-Contact% 53.8% 53.9% 0.1%
Z-Contact% 85.4% 82.4% -3.0%
Contact% 74.0% 70.7% -3.3%
Zone% 46.1% 40.8% -5.3%

Both sets of numbers agree that he's seen fewer pitches in the zone than 2013, with the difference much larger with the PITCHf/x system. This makes intuitive sense; Gomez had a big year at the plate last year, so pitchers don't want to give him good pitches. That would help explain the walk rate increase.

Both sets of numbers agree that he's making less contact, both overall and inside the strike zone. That also makes sense; his strikeout rate is up as well. If he's making less contact, he's certainly walking and striking out more.

One system sees a decrease in O-Swing%, while the other sees an increase. The numbers are basically flip-flopped; the difference is small, though. I'm not confident in asserting that he is swinging at pitches outside the strike zone more or less than 2013.

Where there is an interesting difference is in the O-Contact rate. While both systems have a similar number in the low 50s, the BIS system sees a drastic reduction where the PITCHf/x system does not. If Gomez is making less contact with pitches outside the zone, that could extend some plate appearances when he misses with fewer than two strikes and allow him to take a walk or make contact with a better pitch. This could be helping his walk rate.

After all this examination, have we learned anything? Well, maybe. If Gomez is indeed seeing fewer pitches in the zone, and making less contact with all pitches, it would make sense that his walk rate and strikeout rate are up. His ISO and BABIP are up, so it seems plausible that when he does make contact, he's making contact with better pitches.

Investigating further, I ventured over to Brooks Baseball to double check. The first set of pictures is his swing rate by section of the zone. The first pictures is 2013, and the second picture is 2014.

Carlos_gomez_2013_medium Carlos_gomez_2014_medium

It doesn't look like there is any significant change. If anything, he might be swinging more at inside pitches out of the zone and possibly some more pitches up and out of the zone, specifically, in that center column above the zone.

Here are two more pictures, this time of his whiff rate in 2013 and then 2014.



After looking at all these data, it's difficult to make a firm conclusion on whether or not Gomez has improved his plate discipline. There is some evidence from BIS and PITCHf/x that he is making less contact. Those pictures from Brooks Baseball seem less enthusiastic about a swing rate improvement, but show that he is whiffing more outside the zone, particularly on low pitches and outside pitches. He also appears to be whiffing less inside the zone. The rest of season projections are not optimistic about Gomez retaining his new walk rate, with both Steamer and ZiPS predicting a 7.3% walk rate at the end of the season.

If the increased walk rate is simply due to lack of contact, maybe Gomez hasn't changed his approach at all. Maybe he altered his swing plane for more power, or perhaps this is just small sample noise. A more disciplined Gomez would be terrifying; a relatively unchanged Gomez is still scary. Scary is still good for the Brewers.

. . .

All statistics courtesy of FanGraphs and Brooks Baseball.

Kevin Ruprecht is a Featured Writer for Beyond the Box Score. He also writes at Royal Stats for Everyone. You can follow him on Twitter at @KevinRuprecht.