BIGLEAGUE

Boston Red Sox · Pitcher · #76

Zack Kelly

Age 316' 3" · 231lbBats R · Throws RDebut 2022From Roanoke

ERA

3.31

W-L

0-2

K

14

WHIP

1.29

WAR

0.2

FIP

3.64

League Percentile

2026 season · percentile vs 290 relievers with 20+ IP
the entire league54relief pitchers290
ERA
70
3.31
WHIP
53
1.29
Strikeouts
1
14
K/9
28
7.71
Wins
7
0
Bottom of leagueAverage (50)Top of league

⚠ Below the 20 IP threshold. Percentiles are for reference only.

relief pitchers · by ERA

Top 30%

Zack Kelly's ERA (3.31) ranks above average among 290 relievers with 20+ IP. The number on each bar is a percentile (higher is better); use the tabs to change the comparison pool.

PITCHING

Season · Career
CategoryGamesERAWinsLossesSavesInningsStrikeoutsWalksWHIP
2026 Season173.3102016.11471.29
Career1154.04880131.1127581.31

Hover over a stat for its definition.

ARSENAL

Pitch arsenal · 2026 usage and average velocity
Cutter43.8%avg 146 km/h
Sweeper21.9%avg 131 km/h
Sinker17.0%avg 154 km/h
Four-Seam13.8%avg 155 km/h
Changeup3.5%avg 135 km/h

ADVANCED

Advanced metrics · 2026 season

BABIP

.277

K/9

7.71

BB/9

3.86

HR/9

0.55

Quality starts

0

Whiff%

21.1%

GAME LOG

Last 10 games · includes team result
DateOppInningsHitsERWalksStrikeoutsTeam
05.19@ KC0.21000W
05.14vs PHI0.22001L
05.12vs PHI1.00001L
05.10vs TB0.11110L
05.06@ DET1.00022W
05.03vs HOU1.01120L
05.01vs HOU1.12002W
04.28@ TOR1.01012L
04.26@ BAL0.10000W
04.22vs NYY1.00002L

SPLITS

Situational splits (2026)

Home

Opp AVG.231
IP10.2
K8
WHIP1.13

Away

Opp AVG.238
IP5.2
K6
WHIP1.59

vs LHP

Opp AVG.263
IP4.2
K6
WHIP1.29

vs RHP

Opp AVG.220
IP11.2
K8
WHIP1.29

RISP

Opp AVG.238
IP6.2
K4
WHIP1.05

YEAR BY YEAR

Year-by-year · Career trends

ERALower is better

▼ Trending up year over year
ERA by yearFrom 3.95 in 2022 to 3.31 in 2026. Lower is better for this stat.2022 ERA: 3.953.9520222023 ERA: 3.8620232024 ERA: 3.9720242025 ERA: 4.584.5820252026 ERA: 3.313.312026
Show yearly figures
ERA year-by-year details
YearERA
20223.95
20233.86
20243.97
20254.58
20263.31

WHIPLower is better

▼ Trending up year over year
WHIP by yearFrom 1.32 in 2022 to 1.29 in 2026. Lower is better for this stat.2022 WHIP: 1.321.3220222023 WHIP: 1.611.6120232024 WHIP: 1.251.2520242025 WHIP: 1.3320252026 WHIP: 1.291.292026
Show yearly figures
WHIP year-by-year details
YearWHIP
20221.32
20231.61
20241.25
20251.33
20261.29

Strikeouts

▼ Trending down year over year
Strikeouts by yearFrom 11 in 2022 to 14 in 2026.2022 Strikeouts: 111120222023 Strikeouts: 6620232024 Strikeouts: 616120242025 Strikeouts: 3520252026 Strikeouts: 14142026
Show yearly figures
Strikeouts year-by-year details
YearStrikeouts
202211
20236
202461
202535
202614
YearTeamGamesERAWinsLossesSavesInningsStrikeoutsWalksWHIP
2022BOS133.9510013.21141.32
2023BOS83.860009.1681.61
2024BOS493.9763056.261271.25
2025BOS284.5813035.135121.33
2026BOS173.3102016.11471.29