BIGLEAGUE

Pittsburgh Pirates · Pitcher · #72

Isaac Mattson

Age 316' 2" · 214lbBats R · Throws RDebut 2021From Erie

ERA

5.35

W-L

0-0

K

36

WHIP

1.60

WAR

0.3

FIP

3.72

League Percentile

2026 season · percentile vs 46 qualified pitchers
ERA
0
5.35
WHIP
0
1.60
Strikeouts
0
36
K/9
43
8.38
Wins
0
0
Bottom of leagueAverage (50)Top of league

⚠ Below the qualified innings threshold. Percentiles are for reference only.

the entire league · by ERA

Top 100%

Isaac Mattson's ERA (5.35) ranks below average among 46 qualified pitchers. The number on each bar is a percentile (higher is better); use the tabs to change the comparison pool.

PITCHING

Season · Career
CategoryGamesERAWinsLossesSavesInningsStrikeoutsWalksWHIP
2026 Season385.3500038.236181.60
Career893.9433096.090471.38

Hover over a stat for its definition.

ARSENAL

Pitch arsenal · 2026 usage and average velocity
Four-Seam70.5%avg 151 km/h
Sweeper10.4%avg 133 km/h
Changeup10.2%avg 138 km/h
Slider8.9%avg 137 km/h

ADVANCED

Advanced metrics · 2026 season

BABIP

.347

K/9

8.38

BB/9

4.19

HR/9

0.70

Quality starts

0

Whiff%

21.0%

GAME LOG

Last 10 games · includes team result
DateOppInningsHitsERWalksStrikeoutsTeam
09.05vs LAA2.04302L
08.17vs DET2.02121L
07.28vs AZ1.23113L
07.25vs CHC0.14311L
07.19@ CLE1.00001W
07.18@ CLE1.01002W
07.12vs MIL0.21011W
07.11vs MIL1.01000W
07.08vs ATL1.02101L
07.05@ WSH1.02001W

SPLITS

Situational splits (2026)

Home

Opp AVG.278
IP24.0
K22
WHIP1.63

Away

Opp AVG.288
IP14.2
K14
WHIP1.57

vs LHP

Opp AVG.313
IP19.0
K17
WHIP1.89

vs RHP

Opp AVG.250
IP19.0
K19
WHIP1.37

RISP

Opp AVG.286
IP14.0
K15
WHIP1.64

YEAR BY YEAR

Year-by-year · Career trends

ERALower is better

▲ Trending down year over year
ERA by yearFrom 6.23 in 2021 to 5.35 in 2026. Lower is better for this stat.2021 ERA: 6.236.2320212024 ERA: 5.0620242025 ERA: 2.452.4520252026 ERA: 5.355.352026
Show yearly figures
ERA year-by-year details
YearERA
20216.23
20245.06
20252.45
20265.35

WHIPLower is better

▲ Trending down year over year
WHIP by yearFrom 2.31 in 2021 to 1.60 in 2026. Lower is better for this stat.2021 WHIP: 2.312.3120212024 WHIP: 1.131.1320242025 WHIP: 1.1320252026 WHIP: 1.601.602026
Show yearly figures
WHIP year-by-year details
YearWHIP
20212.31
20241.13
20251.13
20261.60

Strikeouts

▼ Trending down year over year
Strikeouts by yearFrom 3 in 2021 to 36 in 2026.2021 Strikeouts: 3320212024 Strikeouts: 620242025 Strikeouts: 454520252026 Strikeouts: 36362026
Show yearly figures
Strikeouts year-by-year details
YearStrikeouts
20213
20246
202545
202636
YearTeamGamesERAWinsLossesSavesInningsStrikeoutsWalksWHIP
2021BAL46.230004.1352.31
2024PIT35.060005.1651.13
2025PIT442.4533047.245191.13
2026PIT385.3500038.236181.60