Isaac Mattson

2026 seasonregular season

Bats/Throws: R/R
Height: 6' 2"
Weight: 214 lb
Age: 31
Born: Erie, PA, USA
MLB debut: 2021-05-07
Drafted: 2017

Pitch qualityour Stuff+ grades

How nasty each pitch is from its physical shape alone — velocity, spin, movement, extension and release point — on a scale where 100 is league average and every 10 points is one standard deviation. It does not see where the pitch was thrown, the count, or what happened to it, so a pitcher with great stuff and poor command can still give up runs. How it is built

109overall

Four-seam fastball114
Slider97
Changeup93

Pitching

Season	G	GS	IP	ERA	WHIP	K	BB	HR	K/9	W-L	SV
2026	38	0	38.2	5.35	1.60	36	18	3	8.38	0-0	0

Last 10 games

Game	Dec	IP	H	ER	BB	K	P
09/05vLAAL		2.0	4	3	0	2	39
08/17vDETL		2.0	2	1	2	1	41
07/28vAZL		1.2	3	1	1	3	39
07/25vCHCL		0.1	4	3	1	1	26
07/19@CLEW		1.0	0	0	0	1	13
07/18@CLEW		1.0	1	0	0	2	20
07/12vMILW		0.2	1	0	1	1	18
07/11vMILW	HLD	1.0	1	0	0	0	24
07/08vATLL		1.0	2	1	0	1	12
07/05@WSHW		1.0	2	0	0	1	12

Full 2026 game log (38 games)

Game	Dec	IP	H	ER	BB	K	HR	P
09/05vLAAL		2.0	4	3	0	2	0	39
08/17vDETL		2.0	2	1	2	1	0	41
07/28vAZL		1.2	3	1	1	3	0	39
07/25vCHCL		0.1	4	3	1	1	0	26
07/19@CLEW		1.0	0	0	0	1	0	13
07/18@CLEW		1.0	1	0	0	2	0	20
07/12vMILW		0.2	1	0	1	1	0	18
07/11vMILW	HLD	1.0	1	0	0	0	0	24
07/08vATLL		1.0	2	1	0	1	0	12
07/05@WSHW		1.0	2	0	0	1	0	12
07/03@WSHL		1.1	3	4	1	1	2	37
06/30@PHIL		0.2	1	0	0	0	0	9
06/27vCINL		1.0	0	0	0	2	0	13
06/26vCINL		1.0	0	0	0	1	0	12
06/23vSEAL		1.0	0	0	0	1	0	13
06/17@ATHW		1.0	1	1	0	2	1	16
06/14vMIAL		1.1	0	0	2	1	0	27
05/17vPHIL		1.0	1	0	0	0	0	15
05/16vPHIL		1.1	0	0	1	2	0	25
05/10@SFL		0.1	3	2	0	0	0	18
05/07@AZW	HLD	0.1	0	0	0	1	0	6
04/30vSTLL		0.2	3	5	2	0	0	31
04/27vSTLL	HLD	0.1	0	0	0	1	0	3
04/25@MILW		1.0	0	0	0	0	0	4
04/24@MILW		1.0	0	0	1	1	0	14
04/19vTBW	HLD	1.0	0	0	0	1	0	8
04/18vTBL		1.0	0	0	0	0	0	13
04/16vWSHL		1.0	0	0	1	0	0	18
04/14vWSHL		2.0	2	0	0	1	0	33
04/11@CHCW	HLD	1.0	2	0	0	1	0	24
04/10@CHCW	HLD	1.0	0	0	1	0	0	12
04/07vSDW	HLD	0.2	1	0	0	0	0	9
04/06vSDL		1.0	2	0	0	2	0	21
04/04vBALW		1.0	1	0	1	1	0	17
04/01@CINW	HLD	1.1	1	0	0	0	0	22
03/30@CINL		1.0	0	0	1	1	0	15
03/29@NYMW		1.0	0	0	0	2	0	13
03/26@NYML		0.2	3	2	2	1	0	36

Career by season

Season	G	IP	ERA	WHIP	K	BB	HR	K/9	W-L
2021BAL	4	4.1	6.23	2.31	3	5	0	6.23	0-0
2024PIT	3	5.1	5.06	1.13	6	5	0	10.13	0-0
2025PIT	44	47.2	2.45	1.13	45	19	4	8.50	3-3
2026PIT	38	38.2	5.35	1.60	36	18	3	8.38	0-0

Stats from the MLB Stats API, regular season only. A traded player's combined season appears as one row per club plus the total.