Velocity Decliners From the Season’s Start
Here are a few starters who have seen their velocity drop during the 2017 season and my thoughts on each (full list).
Gio Gonzalez (-0.9 mph on 4-seam, -1.9 mph on 2-seam)

Of the pitchers I am examining today, Gonzalez is the toughest to get a read on. Besides a reasonable strikeout rate (8.3 K/9), his sub-3 ERA is the only trait he has going for him. His walk rate (4.3 BB/9) is his highest since 2009. He doesn’t have a good groundball rate and his home runs are up (with the rest of the league).
The velocity drop hasn’t affected his strikeouts since they’ve increased each month (7.0 to 8.7 to 10.5 K/9) while his walks and home runs have been respectable except in May (6.2 BB/9, 1.8 HR/9). The only change in his pitch mix was a small 2-seam usage increase in May which has dropped back down.
If a person needs a narrative on the season, I’d go with following. The 31-year-old lefty probably had a small unreported injury in May which cost him some control and velocity. Even though he’s still throwing slower, he’s learned to be productive with the discomfort. How’s that?
Joe Biagini (-2 mph since starting)

Biagini’s been a popular pitcher with his surprising effectiveness as a starter. I wrote about my concern for him keeping up his improved results and a handful of readers took exception.
The results so far are fine but the continued velocity drop worries me. The decline is reminiscent of Danny Duffy’s drop last season when Duffy transitioned from reliever to starter. Duffy’s velocity never stopped declining last year and we don’t know when Biagini’s will stabilize either.
Biagini’s fastball has seen its swinging strike rate drop hand-in-hand with his velocity.

Right now, Biagini is trying to find out where his talent will stabilize and his owners are just along for the ride.
Scott Feldman (-2.8 mph on sinker)

Normally Feldman shouldn’t be on anyone’s fantasy radar but with the barren pitching landscape, he is a healthy arm. In April, he posted a 3.25 ERA and 7.8 K/9. Since then, his K/9 has dropped each month (7.2 K/9 in May and 6.1 K/9 in June).
Feldman results lineup with his pitch mix. He started the season throwing his cutter more (9% SwStr%) but has moved to his sinker (4% SwStr%). I’m not sure why but I would not be surprised if he had an injury and it hurts more to throw the cutter.
After a good April, Feldman is back to being fantasy irrelevant except in the deepest of leagues.
Mike Foltynewicz (-1.4 mph on 4-seam)

There is so much going wrong with Foltynewicz, I’m not sure where to start. He’s been one of the hardest throwers in the game but has never been effective.
For such a hard thrower, he gets a disappointing number of strikeouts (7.8 K/9 in career), a reasonable number of walks (2.8 BB/9) but gives up an insane number of home runs (1.5 HR/9). Of the pitchers with 250 IP since 2014, Folty’s HR/9 is the 7th highest. Straight, hard fastballs get hit far. Over those same four seasons, his 4.66 FIP is comparable to Tim Lincecum, Edwin Jackson, James Shields, and Kyle Lohse.
With an ineffective fastball, all of his breaking pitches get below average results besides his change (18% SwStr%). His problem is that he throws the change less than 10% of the time. And now his fastball is getting slower.
I think his future is in the bullpen. I just don’t see him being effective as a starter with a slower fastball. He might just be best off to “grip-it and rip-it” in short outings.
Jeff, one of the authors of the fantasy baseball guide,The Process, writes for RotoGraphs, The Hardball Times, Rotowire, Baseball America, and BaseballHQ. He has been nominated for two SABR Analytics Research Award for Contemporary Analysis and won it in 2013 in tandem with Bill Petti. He has won four FSWA Awards including on for his Mining the News series. He's won Tout Wars three times, LABR twice, and got his first NFBC Main Event win in 2021. Follow him on Twitter @jeffwzimmerman.
How often do you see a guy who’s velo drops midseason due to injury bounce back later in the year? In retrospect can you attribute decline to injury? I’m thinking a guy like Triggs. You called it a couple weeks back and saved me from a bad trade. Now he’s on the wire…
It’s tough. Usually, it takes some time off (DL stint) change my mind.
As for injury => velo drop is most of the time unless something like Biagini is going on with a transition or some weird pitch classifications.
I probably shouldn’t, but I feel pretty cool having gotten a mention in this article. *puts on dark shades*
This definitely answered my question anyway, so thanks Jeff!
Edit – Also, oh Folty, you enigma you.
Yeah, it does look like he was referring to you. What I don’t get is this: he said that “a handful of readers took exception.” But when I clicked on the link that Jeff provided, you were the only person who said anything remotely in disagreement with what Jeff had to say about Biagini.
I guess because Jeff was working so hard to compile this exhaustive list (did he do it all by hand?) he used the wrong word. One doesn’t equal a handful.
Enough quibbling about grammar. I went to Brooks Baseball and I looked at the starts Foltynewicz had in 2017. I see only one start where his velocity sat at a little over 93mph (the start vs. St. Louis on 5/5). The rest were closer to 95 or 96. (I’m rounding up the start where he averaged 94.98 on 6/7 vs. the Phillies, because I rounded down the next start.) The average I got for his 13 starts for 2017 was slightly greater than 95.3 mph.
So why am I having trouble interpreting the data on his table that says his decline has been by 2.3 mph? I see no substantial decline in his fastball. Is there something I’m missing on BB, or is it something I’m missing in how Jeff calculates his velocity decline?
Let’s be clear: I’m merely confused about the data. I greatly appreciate the time Jeff took to compile such an exhaustive (and probably exhausting) list.
It was the rec’s the comment got.
Thank god for google. I had no idea what rec’s meant.
As for Folty, was the data I found right or wrong? Just curious, because I often make mistakes when using the Brooks Baseball web site.
I have Folty in a 16 team 12 keeper league. As you can imagine, there aren’t many good pitchers to draft, so I took a flier on him in the 6th round. I didn’t have great expectations for him but I did hope he could average 10-11 pts./start. But he’s only averaging 8 pts.
When Karns or Skaggs get back from the DL should I drop Folty? Or somebody with less upside like Jesse Chavez?
Thanks for that awesome list again!
I don’t know if a drop is needed. Someone has to desperate enough for pitching to buy him.
In one of my leagues, I would because my pitching is on the DL. Now, one move I’ve been making with roster crunches is to trade Folty for a player on the DL (Morton?) At least you get some player back in return.
So if this has anything to do with daily fantasy options, should I not start gio with a really good matchup tonight? http://dfsfreereport.com/get-free-access
Mike referenced in an earlier article that Tanaka hadn’t lost any velocity this season however according to his PITCHf/x velocity, it looks like he’s down about 1.5 ticks if you account for the 0.8 or so difference this season. Thoughts on him this season?
He’s old and has a partially torn UCL. People were more cautious right after the torn UCL was known about. Now he has more mileage on the ligament. He could go anytime.