Driveline Baseball Pitching Trainer @drivelineBB
Kent, WA
Joined March 2025
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Hogan Harris pt. 2
Last week: the return he'd get on a tick of velo, a platoon problem, and a workload gap.
This week: how we'd build his offseason, including the sweeper and cutter shapes we'd work towards, + more.
Other times it’s more structured. Athletic throws to his open and closed side, to IZT targets, fixed targets on the net, or a coach calling out a target mid drill. Baseballs, weighted balls, over and undersized balls, and most days javelins, handballs, softballs or plyos too.
It seems random but isn't and thats by design. High variability now gives him a wider range of solutions, so when the constraints tighten later in the offseason, the adjustments come easier and the intended patterns stick.
Sometimes he chooses the implement. Football throws are a big one for this athlete. Loose, low stakes, more play than practice, and that’s where he opens up and starts exploring how he moves.
When training elite throwers the coach designs the environment. The environment should encourage movement exploration.
Favorite part of the offseason is movement exploration, and early on the job is building an environment the athlete can find his own solutions in.
Rollin Payton Tyler retweeted
Grateful for three years with the Dodgers, @DrivelineBB, @ZachDechant, and everyone who’s supported me.
Excited to join the Astros as the Assistant Director of Player Development, bringing together integrated player development and working with the best players in the world.
Rollin Payton Tyler retweeted
3 years ago, I started at @DrivelineBB
I didn’t even know if I wanted to be a hitting coach.
And here we are.
These are 3 of the biggest things I’ve learned in the last 3 years 🧵
Rollin Payton Tyler retweeted
10/17/26 outing vs Whitworth University
1IP 1H 0ER 1K 0BB
81% strike
@Yaks_Baseball @PTPitching @CoachKrueg @Coach_Panch @jfripp14 @CoachSalsa @PNW_Uncommitted
Rollin Payton Tyler retweeted
10/6/26 Bullpen
FB: 90-91
Sinker: 89-90
Change: 82-83
Sweep: 75-76
@Yaks_Baseball @PTPitching @CoachKrueg @Coach_Panch @jfripp14 @CoachSalsa @PNW_Uncommitted
Rollin Payton Tyler retweeted
9/30/26 bullpen
FB: 89-91
Sinker: 88-89
Change: 80-81
Sweep: 75-76
@Yaks_Baseball @PTPitching @CoachKrueg @Coach_Panch @jfripp14 @CoachSalsa @PNW_Uncommitted
Rollin Payton Tyler retweeted
Nice summary of the #Mariners situation. Not to make excuses for them, but this particular problem is complicated:
"They need to get back to the things that they did in player development. Some of that development stopped/changed/were abandoned in the big league level..."
The Mariners had their coaches plundered in the offseasons, which is common when an org has success developing talent (happens all the time at Driveline and did when I was Dir. Pitching of the Reds, 2014 Astros, etc).
Driveline didn't handle this first wave of poaching well. We did a bad job trying to stem the tide with temporary measures, rather than accepting the reality of the situation and changing our entire structure to accommodate for this inevitable turnover by investing a lot into systems development and employee training.
It's likely Seattle found itself in a similar situation and tried to plug holes rather than holistically change. They're also one of the orgs that have Directors watching minor league results while coaching in the big leagues, which I've consistently opposed.
Being a big league coach OR minor league director is hard enough. Doing both is impossible. They're also very different jobs. An open secret is that most Directors of Pitching (and Pitching Coordinators) are simply biding their time until they get their shot as a big league coach. This isn't great for organizational health. Someone who is in charge of minor league talent and structure needs to be all-in on that and there should be a promotional pathway for them that is exclusive of being a significant part of the big league roster.
Developing minor league talent can be more important than big league success depending on the phase of the organization (in the Mariners case, this isn't true currently - but would be for orgs like the Cardinals, Rockies, Marlins, etc). As such, you can't have the Director looking upwards while being responsible for the farm system.
Anyway, just some words on the restructuring Seattle is about to undergo, one that's probably overdue. Better late than never.
#Mariners press conference takeaways
1) Dipoto doesn't want to get rid of the pitching guys, citing success of 2021-half of 2026. Doesn't want to get rid of guys on 3 month sample.
2) Says they will go outside the organization for new manager, need fresh ideas and fresh thoughts.
3) Pitching needs to get better at finishing at-bats, not just winning 0-0 and 1-1 counts.
4) "Our culture needs a reset." "We didn't beat ourselves for five years and that isn't what we did this year." "We tolerated an environment where we just didn't live up to our own standard, and that's where we need a reset."
5) On accountability: Accountability is a word, unless you are accountable to a standard that is preset. The bigger issue is the standard itself, and Dipoto took responsibility for that. Says he did an ineffective job at that.
6) Mariners TOLERATED too much negativity this year. Goes back to the standard. Dipoto again took responsibility for that.
7) Dipoto did not use injuries as an excuse. He thought the team just figured it would turn around at some point, didn't make it happen.
8) Not thinking about the CBA. Building out the roster, a very busy October-November is coming. Says team will be aggressive in filling holes. They will do an internal audit about why they can't get outside RHH hitters (sans Randy) to succeed.
9) Still believes in the SP. Very clear.
10) Believes in the bullpen, apologize to Bazardo and Ferrer for the heavy workloads. Says they need more depth in that group.
11) You can't be the worst defensive team in baseball. You need to be better prepared and in line with a process that leads to winning.
12) Piggyback situation worked, but Jerry regrets the lack of communication externally on things.
13) "Being a bad defender" is a choice.
14) Cal Raleigh clearly carries real standing in the organization, but he won't be part of interviews.
15) They need to get back to the things that they did in player development. Some of that development stopped/changed/were abandoned in the big league level. Have to get back to what it means to be a Mariner.
16) Dan Wilson's hiring was based on a 35-year interview with the Mariners. The team needed levity and trust with the players at the time. We didn't grow together.
#TridentsUp #Mariners #RefuseToLose
Rollin Payton Tyler retweeted
The Marlins are running one of the most interesting side quests in baseball right now
Their best starters are also their highest-leverage relievers?
Let's talk about it 🧵
Execution prep.
High intent bullpens with the new mix, live ABs as needed.
Simulated ABs with intended zones give instant feedback: how each pitch grades and where to locate for run value, whiff, and chase by batter hand and pitch type.
Practice has to look like the game.
Velo, two new shapes, flatter usage, a workload plan, and command built on top of it.
That's the path to the all-star version of Hogan Harris.
Link to part 1.
xitter.cf/PTPitching/status/2100…
The cutter.
Target: 92-93+ mph, 11-14 in IVB, 0 to +3 in HB. Ideal average looks something like: 92.5, 13 IVB, +1.5 HB.
It isn't a new pitch. He threw it in 2025. The work is getting it back, adding a little HB, and keeping it separated from the sweeper.
Command comes last. We throw to targets all offseason, but once velo and shapes stabilize, command becomes priority #1.
High intent, target-focused throwing with oversized and undersized balls, plus IZT miss distance training to measure exactly how far he misses.
The sweeper.
Target: 79-85+ mph, 11-15 in HB, -1 to +5 in IVB. More velo and more sweep only help vs lefties.
In that range it grades 55 to 70+ vs LHH. It's the shape his arsenal is missing and a third look lefties have to cover.
Velo.
The mechanical room shows up in motion capture: proprietary comp scores and movement analysis built on years of lab data.
Constraints narrow toward faster solutions, with designed high intent days. Mocap, pitch metrics, and velo are the feedback. He finds the solution.
Javelins, footballs, handballs, plyos, softballs, undersize baseballs etc.
Each changes mass, moment arm, and moment of inertia. Add kneeling, single leg, spin and jumping throws, or catching and bouncing it first, and every rep is new.