Jackson Steensma Stats: Statcast, Visuals & Advanced Metrics

P | Bats/Throws: S/R | 6' 4" 244 lbs | Age: 22

Draft: 2025 | Rd. 9, No. 272, Seattle Mariners | Appalachian State

MLB Pipeline Rank

	W	L	ERA	G	GS	SV	IP	SO	WHIP
2026	0	1	1.42	6	4	0	19	29	0.47
Career Minors	0	1	1.42	6	4	0	19	29	0.47

	G	W-L	ERA	IP	SO	WHIP
2026	6	0-1	1.42	19	29	0.47
Career Minors	6	0-1	1.42	19	29	0.47

Standard Splits Game Logs

Standard Minor League Batting Statistics

No Minor League Hitting Statistics.

Standard Minor League Pitching Statistics

Season	Tm	LG	L	L	ERA	G	GS	IP	H	R	ER	BB	SO	WHIP
2026	Inland Empire 66ers	CAL	A	1	1.42	6	4	19.0	7	3	3	2	29	0.47
	Inland Empire 66ers	CAL	A	1	1.42	6	4	19.0	7	3	3	2	29	0.47
Career Minors	Inland Empire 66ers	CAL		1	1.42	6	4	19.0	7	3	3	2	29	0.47

Standard Minor League Fielding Statistics

Season	Tm	LG	L	POS	G	GS	INN	TC	PO	A	FPCT%
2026	Inland Empire 66ers	CAL	A	P	6	4	19.0	5	3	2	1.000
	Inland Empire 66ers	CAL	A	P	6	4	19.0	5	3	2	1.000
Career Minors	Inland Empire 66ers	CAL		P	6	4	19.0	5	3	2	1.000

Scouting Report

2026

A Michigander during his high school days, Steensma headed to Boone, North Carolina, home to Appalachian State, for college ball. After pitching out of the bullpen as the Mountaineers' closer, racking up seven saves as a freshman in 2023, he moved into the rotation as a sophomore, finishing among the Sun Belt Conference top 10 in a host of pitching categories. An elbow injury that required Tommy John surgery in December 2024 kept him off the mound in '25, but a combination of Mariners scouts and their analytics department saw enough potential from his performance the year prior to take him in the ninth round of last July's Draft. Now healthy, he got off to a very good start during his pro debut at Single-A in 2026.

A strong 6-foot-4 right-hander, Steensma has a potential four-pitch mix that gives him a chance to start. While his fastball sits 92-93 mph and touches 95, it plays up and misses bats thanks to riding life that comes as a result of the combination of good extension and low release height. His tight mid-80s slider has ticked up since his college days and could be an out pitch in time. He'll mix in an 80 mph curve, and while he does have a potentially serviceable changeup, he wasn't throwing it much at the outset of his pro career.

The Mariners are bullish about Steensma because he's still learning how to mix his pitches effectively. He was throwing a ton of strikes out of the gate, with the organization thinking he could have future plus command. They don't want to put unfair expectations on him, but the Mariners have done excellent development work with formerly injured college arms taken later on Day 2 of the Draft, like sixth-rounder-turned-All-Star Bryan Woo.

Transactions

Team	Date	Transaction
	05/20/2026	Inland Empire 66ers placed RHP Jackson Steensma on the 7-day injured list.
	04/01/2026	RHP Jackson Steensma assigned to Inland Empire 66ers from ACL Mariners.
	08/04/2025	RHP Jackson Steensma assigned to ACL Mariners.
	07/19/2025	Seattle Mariners signed RHP Jackson Steensma.
	05/05/2023	RHP Jackson Steensma assigned to Johnson City Doughboys.
	06/17/2022	RHP Jackson Steensma and assigned to High School Workout.

Platoon Splits

Team	L	Type	W	L	ERA	G	GS	SV	IP	BF	H	R	ER	HR	BB	SO	WHIP
Inland Empire 66ers	Single-A	vs Left				6			10.0	30	0			0	1	18	0.10
Inland Empire 66ers	Single-A	vs Right				5			9.0	36	7			0	1	11	0.89

Monthly Splits

Team	L	Type	L	ERA	G	GS	IP	BF	H	R	ER	BB	SO	WHIP
Inland Empire 66ers	Single-A	April	1	0.90	4	2	10.0	34	3	1	1	1	17	0.40
Inland Empire 66ers	Single-A	May	0	2.00	2	2	9.0	32	4	2	2	1	12	0.56
Inland Empire 66ers	Single-A	First Half	1	1.42	6	4	19.0	66	7	3	3	2	29	0.47

Baserunner Splits

Team	L	Type	G	IP	BF	H	BB	SO	WHIP
Inland Empire 66ers	Single-A	Bases Empty	6	15.0	52	5	2	23	0.47
Inland Empire 66ers	Single-A	Runner at 1st	4	1.0	3	1	0	1	1.00
Inland Empire 66ers	Single-A	Runners at 1st & 3rd	2	0.1	1	0	0	1	0.00
Inland Empire 66ers	Single-A	Runner at 2nd	3	1.0	4	1	0	2	1.00
Inland Empire 66ers	Single-A	Runners at 2nd & 3rd	2	0.2	2	0	0	1	0.00
Inland Empire 66ers	Single-A	Runner at 3rd	2	1.0	4	0	0	1	0.00
Inland Empire 66ers	Single-A	Scoring Position	4	3.0	11	1	0	5	0.33

Game Type Splits

Team	L	Type	W	L	ERA	G	GS	SV	IP	BF	H	R	ER	BB	SO	WHIP
Inland Empire 66ers	Single-A	Home Games	0	1	2.25	2	2	0	8.0	30	4	2	2	1	14	0.63
Inland Empire 66ers	Single-A	Away Games	0	0	0.82	4	2	0	11.0	36	3	1	1	1	15	0.36
Inland Empire 66ers	Single-A	Day Games	0	1	1.69	4	4	0	16.0	57	7	3	3	2	22	0.56
Inland Empire 66ers	Single-A	Night Games	0	0	0.00	2	0	0	3.0	9	0	0	0	0	7	0.00
Inland Empire 66ers	Single-A	Leading Off Inning				6			5.1	19	3			0	7	0.56

Outs Splits

Team	L	Type	G	IP	BF	H	BB	SO	WHIP
Inland Empire 66ers	Single-A	No Outs	6	6.2	22	3	0	8	0.45
Inland Empire 66ers	Single-A	One Out	6	6.0	22	1	2	11	0.50
Inland Empire 66ers	Single-A	Two Outs	6	6.1	22	3	0	10	0.47

Inning Splits

Team	L	Type	ERA	G	IP	BF	H	R	ER	BB	SO	WHIP
Inland Empire 66ers	Single-A	First Inning	0.00	4	4.0	15	2	0	0	1	7	0.75
Inland Empire 66ers	Single-A	Second Inning	0.00	4	4.0	12	1	0	0	0	2	0.25
Inland Empire 66ers	Single-A	Third Inning	2.25	4	4.0	15	2	1	1	1	7	0.75
Inland Empire 66ers	Single-A	Fourth Inning	4.50	4	4.0	15	2	2	2	0	8	0.50
Inland Empire 66ers	Single-A	Fifth Inning	0.00	3	3.0	9	0	0	0	0	5	0.00

Date	Home Tm	Away Tm	L	ERA	G	GS	IP	H	R	ER	BB	SO	WHIP
2026-04-04	Rancho Cucamonga Quakes	Inland Empire 66ers	0	0.00	1	0	2.0	0	0	0	0	4	0.00
2026-04-14	Visalia Rawhide	Inland Empire 66ers	0	0.00	1	0	1.0	0	0	0	0	3	0.00
2026-04-19	Visalia Rawhide	Inland Empire 66ers	0	0.00	1	1	3.0	1	0	0	1	3	0.33
2026-04-26	Inland Empire 66ers	Stockton Ports	1	0.90	1	1	4.0	2	1	1	0	7	0.40
April	Inland Empire 66ers		1	0.90	4	2	10.0	3	1	1	1	17	0.40
2026-05-03	Rancho Cucamonga Quakes	Inland Empire 66ers	0	1.20	1	1	5.0	2	1	1	0	5	0.40
2026-05-10	Inland Empire 66ers	Lake Elsinore Storm	0	1.42	1	1	4.0	2	1	1	1	7	0.47
May	Inland Empire 66ers		0	2.00	2	2	9.0	4	2	2	1	12	0.56