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MLB · P
Isaac Mattson
Mariners
· SEA · 2026
31 · 6'2" · B/T R/R
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2026
Career
5.35
ERA
0-0
W-L
36
K
1.60
WHIP
38.2
IP
0
SV
38
GP
8.4
K/9
3.94
ERA
3-3
W-L
90
K
1.38
WHIP
96.0
IP
0
SV
89
GP
8.4
K/9
Full career →
Seasons
Season
G
W
L
IP
SO
ERA
WHIP
PI
2026
PIT
38
0
0
38.2
36
5.35
1.60
PI
2025
PIT
44
3
3
47.2
45
2.45
1.13
PI
2024
PIT
3
0
0
5.1
6
5.06
1.13
Full career →
Last 5 games
Game
Result
IP
H
ER
K
LA
vs LAA
Sep 5
L
1-6
2.0
4
3
2
DE
vs DET
Aug 17
L
5-8
2.0
2
1
1
AZ
vs AZ
Jul 28
L
7-8
1.2
3
1
3
CH
0.1
4
3
1
1.0
0
0
1
vs CHC
Jul 25
L
0-11
CL
@ CLE
Jul 19
W
7-1
Full game log →
Isaac has no game in the next two weeks, so there are no lines.
Strikeouts history
Outs recorded history
Isaac Mattson props
2026 AL West Standings
W
L
PCT
GB
1
HO
Astros
81
81
.500
—
2
TE
Rangers
80
82
.494
1.0
3
SE
Mariners
76
86
.469
5.0
4
OA
Athletics
64
98
.395
17.0
5
LA
Angels
62
100
.383
19.0
Full standings →
More Mariners
R/G
4.10
28th
RA/G
4.46
16th
RUN DIFF
-58
23rd
HR/G
1.12
16th
H
7.73
29th
BB
3.44
10th
K
8.64
22nd
SB
0.71
10th
Team page →
Latest news
Mariners claimed RHP Isaac Mattson off waivers from the Pirates
NBC Sports / Rotoworld ·
Nov 2, 2026, 3:18 PM EST
Pirates placed RHP Isaac Mattson on the 15-day injured list, retroactive to September 6, with hip inflammation.
NBC Sports / Rotoworld ·
Sep 8, 2026, 6:28 PM EDT
Pirates recalled RHP Isaac Mattson from Triple-A Indianapolis.
NBC Sports / Rotoworld ·
Sep 4, 2026, 5:58 PM EDT
All news →