Merrill Kelly

Pitcher · Career Stats, Bio & Records (2019-2026)

Merrill Kelly is a pitcher who has played in Major League Baseball since 2019 for the Arizona Diamondbacks, the Texas Rangers, and the Arizona Diamondbacks, a span of 8 seasons. Across 201 career appearances, he has gone 75-67 with a 3.93 ERA and 1,024 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 6429.2.

W (Wins):
Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
ERA (Earned Run Average):
Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
SO (Strikeouts):
For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
WHIP (Walks and Hits per Inning Pitched):
Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.

Data updated

Active Player
W–L 75–67
ERA 3.93
WHIP 1.23
SO 1,024
Pitcher PIV thru 2025 6429.2
Position
Pitcher
Bats / Throws
R / R
Height / Weight
6'2" / 202 lb
Born
10/14/1988 in Houston, TX, USA
MLB Debut
2019-04-01
Jersey
#29

Full name: Kenneth Merrill Kelly

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Career Pitching Statistics

Merrill Kelly — Career Pitching Statistics
W L G GS CG SHO SV IP H ER HR BB SO ERA Pitcher PIV
75 67 201 201 1 0 0 1170.1 1,073 511 158 370 1,024 3.93 6429.2

Career ERA 3.93 vs. league average 4.22 across their career seasons — 7.0% better than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Merrill Kelly Stats, Bio & Career Records
Year Team Lg W L G GS CG SHO SV IP H ER BB SO ERA Lg ERA Pitcher PIV
2019 ARI NL 13 14 32 32 0 0 0 183.1 184 90 57 158 4.42 4.51 (+2%) -33.1
2020 ARI NL 3 2 5 5 0 0 0 31.1 26 9 5 29 2.59 4.45 (+42%) 365.8
2021 ARI NL 7 11 27 27 0 0 0 158.0 163 78 41 130 4.44 4.27 (-4%) 647.6
2022 ARI NL 13 8 33 33 0 0 0 200.1 167 75 61 177 3.37 3.97 (+15%) 1652.0
2023 ARI NL 12 8 30 30 0 0 0 177.2 143 65 69 187 3.29 4.33 (+24%) 2236.1
2024 ARI NL 5 1 13 13 0 0 0 73.2 67 33 19 63 4.03 4.08 (+1%) -321.1
2025 ARI NL 9 6 22 22 0 0 0 128.2 98 46 38 121 3.22 4.16 (+23%) 1916.2
2025 TEX AL 3 3 10 10 0 0 0 55.1 59 26 10 46 4.23 4.16 (-2%) -34.4
2026 AZ NL 10 14 29 29 1 0 0 162.0 166 89 70 113 4.94 4.18 (-18%) -
Career · 9 seasons 75 67 201 201 1 0 0 1,170.1 1,073 511 370 1,024 3.93 — 6,429

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Career Batting Statistics

Merrill Kelly — Career Batting Statistics
G AB R H 2B 3B HR RBI SB BB SO AVG OBP SLG OPS PIV
172 99 4 4 1 0 0 3 0 6 52 .040 .095 .051 .146 -1,299

Career AVG .040 vs. league average .246 across their career seasons — 83.6% below league average.

Career OBP .095 vs. league average .317 across their career seasons — 69.9% below league average.

Career SLG .051 vs. league average .410 across their career seasons — 87.7% below league average.

Career OPS .146 vs. league average .727 across their career seasons — 80.0% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Merrill Kelly — Season-by-Season Batting
Year Team Lg G AB R H 2B 3B HR RBI SB BB SO AVG Lg AVG Lg OBP Lg SLG Lg OPS PIV
2019 ARI NL 32 52 3 1 0 0 0 2 0 2 25 .019 .252 (-92%) .322 (-83%) .434 (-96%) .757 (-90%) -775.9
2020 ARI NL 5 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2021 ARI NL 27 47 1 3 1 0 0 1 0 4 27 .064 — — — — -523.3
2022 ARI NL 33 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2023 ARI NL 30 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2024 ARI NL 13 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2025 ARI NL 22 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2025 TEX AL 10 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
Career · 8 seasons 172 99 4 4 1 0 0 3 0 6 52 .040 — — — — -1,299

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Postseason Statistics

Playoff Career Batting

Merrill Kelly — Playoff Career Batting
G AB R H 2B 3B HR RBI BB SO AVG
4 0 0 0 0 0 0 0 0 0 .000

Playoff Batting by Year

Merrill Kelly — Playoff Batting by Year
Year Round Team G AB R H 2B 3B HR RBI BB SO AVG
2023 NLCS ARI 2 0 0 0 0 0 0 0 0 0 .000
2023 NLDS2 ARI 1 0 0 0 0 0 0 0 0 0 .000
2023 WS ARI 1 0 0 0 0 0 0 0 0 0 .000

Playoff Career Pitching

Merrill Kelly — Playoff Career Pitching
W L G GS SV IP H ER BB SO ERA
3 1 4 4 0 24.0 12 6 8 28 2.25

Playoff Pitching by Year

Merrill Kelly — Playoff Pitching by Year
Year Round Team W L G GS SV IP H ER BB SO ERA
2023 NLCS ARI 1 1 2 2 0 10.2 6 5 6 14 4.22
2023 NLDS2 ARI 1 0 1 1 0 6.1 3 0 2 5 0.00
2023 WS ARI 1 0 1 1 0 7.0 3 1 0 9 1.29

Game Log & Splits

View full game log (344 games) →

Per-game data from Retrosheet (regular season, through 2025).

Batting — Home / Away

Merrill Kelly — Batting — Home / Away
SplitGABRHHRRBIAVG
Home87481303.062
Away85513100.020

Pitching — Home / Away

Merrill Kelly — Pitching — Home / Away
SplitGIPHERBBSOERA
Home87526.04541921475073.29
Away85482.14532301534044.29

Last 10 Games — Pitching

Merrill Kelly — Last 10 Games — Pitching
DateTmOppDecIPHRERBBSOHR
2025-09-21 TEXMIA L 4.1733040
2025-09-16 TEXHOU L 3.0966110
2025-09-10 TEXMIL W 5.21033062
2025-09-05 TEXHOU — 7.0511170
2025-08-30 TEXOAK W 6.1633022
2025-08-24 TEXCLE W 7.0400280
2025-08-19 TEXKCR — 6.0222032
2025-08-13 TEXAZ — 6.0722151
2025-08-08 TEXPHI L 4.1544542
2025-08-02 TEXSEA — 5.2422060

Fielding Statistics

Career Fielding Totals by Position

Merrill Kelly — Career Fielding Totals by Position
Position G GS PO A E DP
P 172 172 90 91 12 8

Season-by-Season Fielding

Merrill Kelly — Season-by-Season Fielding
Year Team Pos G GS PO A E DP
2019 ARI P 32 32 21 14 4 2
2020 ARI P 5 5 7 3 0 0
2021 ARI P 27 27 13 16 0 2
2022 ARI P 33 33 15 19 1 2
2023 ARI P 30 30 12 12 2 2
2024 ARI P 13 13 9 5 2 0
2025 ARI P 22 22 8 15 2 0
2025 TEX P 10 10 5 7 1 0

Career Games by Position

Position Diamond

Circle size = games played at each position.

Merrill Kelly — Career Games by Position
Position Games
Pitcher 172

Awards & Honors

Merrill Kelly — Awards & Honors
Year Award Notes
2022 Pitcher of the Month July
2022 Player of the Week Week of 2022-07-30

Most Similar Players

Career comps based on counting + rate stats and primary position. Score is relative — closest peer anchors at ~98%.

  1. 98
    Mat Latos
    71-59, 3.64 ERA
  2. 94
    Sandy Alcantara
    65-78, 3.69 ERA
  3. 82
    Luis Severino
    75-61, 3.93 ERA
  4. 80
    Shaun Marcum
    61-48, 3.93 ERA
  5. 73
    Pablo Lopez
    59-53, 3.81 ERA
  6. 69
    Joe Musgrove
    66-62, 3.73 ERA

Merrill Kelly: the record in brief

Active since a debut on April 1, 2019, Merrill Kelly has a record on this page that is still being added to. By club, Kelly's seasons break down as the Arizona Diamondbacks (2019 to 2025) and the Texas Rangers (2025). Kelly played primarily as a pitcher and both batted and threw right-handed. The bio adds a birth date on October 14, 1988, in Houston, TX, USA and a listed size of 6-foot-2 and 202 pounds. Kelly's full given name, per the bio, is Kenneth Merrill Kelly.

Kelly has gone 75-67 with a 3.93 ERA in 201 games, 201 of them starts. The totals include 1,024 strikeouts. Against a 4.22 league ERA for the same years, Kelly was 7.0% better. Kelly won 13 games in 2019, the most of any season listed. Kelly struck out 187 batters in 2023, a career high. In 2025, one of the busiest seasons, Kelly posted a 3.22 ERA; the league figure that year was 4.16.

Frequently Asked Questions about Merrill Kelly

What years did Merrill Kelly play?
Merrill Kelly played in Major League Baseball from 2019 to 2026.
Was Merrill Kelly a pitcher?
Yes. Merrill Kelly pitched in the major leagues, recording 75 wins and 1024 strikeouts.
How many home runs did Merrill Kelly hit?
Merrill Kelly hit 0 career home runs with 4 hits.
What teams has Merrill Kelly played for?
Merrill Kelly has played for 2 teams: the Arizona Diamondbacks (2019–2026) and the Texas Rangers (2025).
What are Merrill Kelly's career stats?
In 201 games, Merrill Kelly has gone 75-67 with a 3.93 ERA, 1,024 strikeouts, and 1,170.1 innings pitched.
What position does Merrill Kelly play?
Merrill Kelly plays primarily as a pitcher, the position where he has appeared in the most games.
How tall is Merrill Kelly and how much does he weigh?
Merrill Kelly is listed at 6 feet 2 inches and 202 pounds.
What number does Merrill Kelly wear?
Merrill Kelly wears number 29, according to MLB's 2026 roster data.
What was Merrill Kelly's career ERA?
Merrill Kelly finished with a 3.93 career ERA, going 75-67 with 1,024 strikeouts.
How many strikeouts did Merrill Kelly have?
Merrill Kelly recorded 1,024 career strikeouts.