Director of Hitting @DrivelineBB
Seattle, WA
Joined March 2011
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Pinned Tweet
Hitting Biomechanics vizzies remain undefeated 🔥
Interested in knowing exactly how your swing compares to MVP caliber MLB hitters?
Come through @DrivelineBB this Summer to go through our Hitting Biomechanics and force plate assessment in our motion capture lab
Tanner Stokey retweeted
Trent Grisham went from a 129 wRC+ in 2025 to a 98 wRC+ in 2026.
Of the Driveline big 3, his Power Grade took the biggest hit, going from a 66 to a 52. His Contact Grade got better and his Swing Decision Grade saw a small tick down.
Let’s take a quick look at what changed for Grisham in 2026 that led to less power output... 🧵
Tanner Stokey retweeted
The flow drill gives his upper half time to turn and coil into the load.
As hitting trainer Jorge Arrate put it, without that "you kind of just push."
Full swing design on YouTube.
Tanner Stokey retweeted
Where does this quickness come from?
Keeping the barrel in line with the lead humerus in the frontal plane (umpire view) gets the barrel to contact 13.2 ms quicker, with 27% more early barrel acceleration at the same bat speed
In line = efficient path
#ProjectBows
Tanner Stokey retweeted
When we want more consistency from a hitter, do we really know what we’re looking for?
In the mocap lab, bat speed was more consistent from swing to swing than the movements that produced it.
Do the best hitters really repeat their mechanics, or is there more to the story?
Tanner Stokey retweeted
For hitters who are remote/haven't been in gym for awhile we are also able to detect path anomalies (⬇️) using our full signal Blast Motion visuals.
Just another way that we are able to provide one of the best training experiences in the world for our athletes @DrivelineBB.
VBA & Swing Path Tilt ➡️ not the same metric.
LHH⬇️= Steep Tilt w/ flat VBA @ contact
RHH⬇️= Steep Tilt & holds line through contact
Tilt is the plane the barrel moves through 40 MS before contact while VBA is the barrel's angle measured @ contact.
Discrepancies between the two often lead to poor connection @ impact & could be a result of a hitter making last minute compensations in their swing to try & achieve flush contact.
Tanner Stokey retweeted
More Big Data on youth hitting development coming to your favorite YouTube channel very soon
📈📈📈
Emilio Corona was released in 2025, came to Driveline to rebuild the load and improve his attack angle. We saw slumps that used to last two or three weeks now last two or three days. After making these changes he raked in the 2026 season putting up a .355/.425/.654 slash line while also raising his OPS by 170 points to go along with 20 HRs, 51 total XBH, 89 RBIs and 43 stolen bases!
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491
Tanner Stokey retweeted
LETS GO!!!!
.@AFredericks2027 was already hitting .450 with a .702 SLG, 4 triples, and 2 home runs, and committed to Nevada.
But she still wanted more.
After 7 weeks of training at Driveline:
Max EV: 73.2 ➡️ 77.6 mph (+4.4)
Avg EV: 64.0 ➡️ 66.6 mph (+2.6)
Bat Speed: 58.5 ➡️ 60.5 mph (+2.0)
Max Distance: 241 ➡️ 261 ft (+20)
Tanner Stokey retweeted
Today's iPitch for the pro groups: Aaron Ashby
Tried to replicate his Sinker & Curveball with Leather Smash Balls
Tanner Stokey retweeted
Quickest and Slowest to the ball in 2026 (300+ swings)
Time to contact = 1.3636 × swing length / bat speed
Swing acceleration = 0.03343 × bat speed² / swing length
What do you see?
Tanner Stokey retweeted
Emily (@CoolbaughDL) will be in Las Vegas at the MLB General Manager meetings this week for all things Driveline + Dominican Republic.
I'll be in tagging in via Zoom as needed! Schedule a meeting via email: [email protected].
teapawt.org/drivelinekyle/status/2…
Wrapping up our time at our Dominican Republic 🇩🇴 facility.
We’re located right next to #Birdland’s complex and we’ll be open for business in a few weeks.
Full-size baseball field with advanced Driveline-proprietary tech 🤫 coming in March 2027.
For more info: @CoolbaughDL
📈📈📈
.@AFredericks2027 was already hitting .450 with a .702 SLG, 4 triples, and 2 home runs, and committed to Nevada.
But she still wanted more.
After 7 weeks of training at Driveline:
Max EV: 73.2 ➡️ 77.6 mph (+4.4)
Avg EV: 64.0 ➡️ 66.6 mph (+2.6)
Bat Speed: 58.5 ➡️ 60.5 mph (+2.0)
Max Distance: 241 ➡️ 261 ft (+20)
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441
Tanner Stokey retweeted
Alex squats in his load. Once he squats, he can't hold his posture as he moves forward, so there's no connection early in the swing or at contact. The barrel just rips flat and across.
Set-Up
- Oppo angle SL
- Underload bat + Smash Bat
Step Back Pivot Pick
- Loads him into his backside with a hinge instead of a squat
- Teaches him to hold that posture into foot plant
- Keeps him connected early so the barrel doesn't rip flat and across
Tanner Stokey retweeted
The Triples King 👑
ALT First player in MLB history to rank atop the Majors in triples in 3+ straight seasons 7 | Corbin Carroll The graphic features two images of Corbin Carroll after hitting a triple. The larger one is inside a circle and shows him yelling at the dugout and celebrating his triple. In the smaller image, he is running to third base. In both images, he is wearing a black Diamondbacks jersey and white baseball pants. The graphic also includes Carroll's signature in white.
Tanner Stokey retweeted
Top 10 wOBA leaders and the paths that created it.
The paths vary, but the speed doesn't
- 8 of 10 swing faster than league average (71.8 mph)
Tanner Stokey retweeted
Dylan Crews has yet to establish himself in the Bigs
High Whiff and low HH EV LA (8.4° 90th% LA, League Average 12°), have led to production not matching his tools (Which are very LOUD)
A quick look at why and how we'd go about making the adjustment🧵🧵
Tanner Stokey retweeted
Dylan Crews would get a variety of hinge focused drill work (Kershaw, Step Behind, Step Back Pivot Pick) to introduce loading the posterior chain.
Combo that with closed angle breaking balls with high pull side ball flight targets and Operation Space is in business.
Tanner Stokey retweeted
Top 3 hitters who open up the most
High ideal attack angle
They swing fast
They hit it hard
These guys rock!
Tanner Stokey retweeted
This offseason has the potential to be a unique one for professional baseball players.
Typically, the offseason is a pretty short window to recover, develop, and prepare for the upcoming season.
A longer offseason could change that, but only if athletes approach it differently.
