Justin Karn

Manager Westside Woolly Mammoths @USPBL

[American Association @AA_Baseball]

April 17 Transaction: @canaries signed OF Anthony Sharkas (@anthonysharkas).

The @emu_baseball and @mucrusadersbsb alum previously played in the @uspbl.

[Justin Karn @JKarn41]

https://t.co/1KHnQXZCft

[Matt Cripsey @MattCripsey]

22 years old, explosive arm, D1 experience.

At UT-Martin: 9.22 ERA, 67.1 IP, 51 BB, 14 HBP. Sat low 90s, touched mid-90s.

The upside was real, he just needed a plan.

That’s where the USPBL came in (1/🧵)
@ChoyceDiffey @JKarn41 @USPBLdevelop

[Justin Karn @JKarn41]

Choyce willed himself into this opportunity. He would be the first to tell you he needed to get better to have a chance, and he fully committed to doing so.

Below is a portion of @MattCripsey mid season write up on Choyce’s in game velo progression. The full thread is below

[Tread Athletics @TreadHQ]

Congrats to longtime Tread athlete @ChoyceDiffey on signing with the @whitesox 🧦⁠
⁠
The 23-year-old is coming off his first pro season, where he was an All-Star in the USPBL (and ran it up to 97). 🔥⁠
⁠
Coach: @imstilllucas

[Matt Cripsey @MattCripsey]

So proud of @ChoyceDiffey. Absolute grinder. Made some big strides this past season. Another one moves on from the USPBL!

Shoutout to @JKarn41, and congrats to the team at Tread and @imstilllucas as well

[Justin Karn @JKarn41]

@BaseballAmerica @jjcoop36 Great article

[Noah Bieniek (Bee-Nick) @NoahB77_]

.@OaklandBSB and their shortstop Kyle Revere got the better of Michigan State and Revere’s high school teammate Noah Bright, who started this game behind the plate

“Rev” (Madonna transfer) is 7-11, with 4 RBI, and 2 runs against the in-state Big Ten foes

[Justin Karn @JKarn41]

@mikerice02 Very unique seam shift

[Justin Karn @JKarn41]

He’s at the point where the spread is actually too dramatic and the pitches aren’t effectively tunneling

[Rob Friedman @PitchingNinja]

McLean is throwing Wiffle balls.

[Indy Ball Report @indyballpod]

Some contract data for you on this late night

[Justin Karn @JKarn41]

@AKA_WitchDoctor @MotorPreference Bartolo effectively blocked. Lead leg extension is not for everyone though.

[Justin Karn @JKarn41]

@JWonCATCHING Likely a heavily pronation bias release which is why the CB is spiked

[Justin Karn @JKarn41]

@nickycos45 @TreadHQ @FranchFrys25 @FlatgroundApp Sweeper lookin nasty brotha!

[Indy Ball Report @indyballpod]

WRAPPING UP THE HOLIDAY SEASON WITH SOME HOUSEKEEPING! CHECK OUT THE CHANGING FACES THIS WEEK! #IndyBallReport

https://t.co/i8O5BrnVU3

[USPBLdevelopment @USPBLdevelop]

The Westside Woolly Mammoths of the USPBL are excited to announce the signing of Left Handed Pitcher Gavin Brasosky for the 2026 season.
#RealBaseballRealFun
#WhosNext

[USPBL @uspbl]

A new era is officially underway in Westside.

Justin Karn enters his fifth season in the USPBL and his first full season as Manager of the Westside Woolly Mammoths—and he’s already set the bar high. After taking over late in 2024, Justin led the Mammoths on an incredible 18–2 run to the top playoff seed, powered by one of the most dominant pitching stretches in league history.

With a proven track record of success at every level—from NCAA Division I to conference championships and pro player development—Justin brings energy, preparation, and leadership to the dugout. From rewriting record books in college baseball to commanding the Mammoths’ staff, the future in Westside is bright.

Mammoths fans, get ready. This is just the beginning.

[Justin Orenduff @JustinOrenduff]

Meet the Managers for the 2026 @uspbl season!

Jim Essian - Utica Unicorns
Paul Noce - Birmingham Bloomfield Beavers
Ryan Kottke - Eastside Diamond Hoppers
Justin Karn - Westside Woolly Mammoths

The managers are the pulse of the USPBL. They represent the standard of leadership, respect, professionalism, and mentorship for our players.

Their role is vital to the success of the USPBL and everything we are trying to accomplish. The vision and direction of our league is carried out through them daily.

I want to thank each one of them for their commitment to the USPBL and their dedication to helping our players achieve their dreams.

To read more about our managers, and their accomplishments, visit: https://t.co/qofl9tx9YW

[Justin Karn @JKarn41]

@AKA_WitchDoctor Also probably a level of diminishing returns w top end bat speed for most players

[New York Jets @nyjets]

We are heartbroken to share the news of Nick Mangold’s sudden passing.

[Justin Karn @JKarn41]

@TreadAthletics Agreed. Have seen many guys get into a super depth squat like position and then extend or spin out of it and cannot get their pelvis rotating on time and the block is non existent/not timed up

[Justin Karn @JKarn41]

Shark checks all the boxes.., Handles velo, ride, sink, spin, all 4 quadrants, rarely expands zone. Simply a winning player and person!

[Anthony Sharkas @anthonysharkas]

Looking for professional opportunities

2025 USPBL MVP
2025 USPBL Batting Title
.372 BA / .452 OBP / .517 SLG
54 hits in 39 games played
20 Stolen Bases

6’2” 200lbs
OF

@JKarn41 @T_Gelly @TJHannam10