Players / Player profile
TB · P

Ian Seymour

Age 27 B/T L/L 6′0″, 215 lb USA MLB debut 2025
40-man Dead-weight pitch
  • Tampa Bay’s roster as it stands #4 starter · 106 IP · 1.2 WAR in the role
  • Trade read Available at a price: TB 36% playoff odds; control through 2031.
Keystone Stuff 96 32nd pct
2026 fWAR 1.5
Projected 2027 WAR 1.1 at 102 IP · 1.2 in his 2027 role

Pitching · 2026 percentiles

vs. MLB pitchers with 500+ pitches · 2,123 pitches

Keystone Stuff 96 Keystone Stuff: 96, 32nd percentile
Keystone Location 110 Keystone Location: 110, 89th percentile
Keystone Pitching 103 Keystone Pitching: 103, 68th percentile
Run value (xRV) +0.76 Run value (xRV): +0.76, 83rd percentile
Strikeout % 28.7% Strikeout %: 28.7%, 88th percentile
Walk % 6.5% Walk %: 6.5%, 84th percentile
Whiff % 29.3% Whiff %: 29.3%, 79th percentile
Chase % 35.3% Chase %: 35.3%, 91st percentile
Fastball velo 90.8 Fastball velo: 90.8, 5th percentile
Extension 6.3 ft Extension: 6.3 ft, 35th percentile
132.2 IP4.21 ERA4.09 FIP 41° arm2 SV

Arsenal & Pitch Lab

Movement normalized to arm side · Keystone Stuff by pitch

−20−20−10−100010102020← Glove sideArm side →Rise (IVB, in) →CH4SSTSISL
LHP · arm angle 41° · how to read
PitchUseVeloIVBHBStuffLocWhiffxRV/100
Changeup29% use29%83.47.9+15.49210239%+0.93
Four-seam27% use27%91.416.8+6.89410726%+1.14
Sweeper20% use20%81.69.6−12.011711033%+1.48
Sinker16% use16%89.910.2+15.18610711%−0.51
Slider7% use7%83.212.3−3.410210929%+0.68
Dead weight

Sinker grades 86 and gets below-average expected results on 16% usage. Against righties, moving about 5 of every 100 pitches to the sweeper (117 Stuff), about 50% of his sinkers to them, is worth an estimated 0.6 runs per season, after a 50% haircut for diminishing returns. vs. righties: the sweeper is worth +1.6 runs per 100 pitches more, 2.1 standard errors (270 and 157 pitches; his own results against that side combined with Stuff and the league’s platoon split). His fastballs stay at 35%+.

Most similar pitchers

Pitches like Seymour: same hand, shape, slot and mix

SimilarityPlayerStuff’26 WAR’27 proj2027
50Shota Imanaga CHC · ’93961.81.3Free agent
49Patrick Sandoval BOS · ’961061.31.3Free agent
45Andrew Abbott CIN · ’991001.42.0Arb
43José Suarez ATH · ’98950.60.4Free agent
41Jeffrey Springs ATH · ’9296−0.40.3Free agent

Shota Imanaga (similarity 50, 1.3 WAR projected for 2027) is a free agent this winter: a similar arsenal available without trading talent, at a free agent’s price. Opportunity Finder →

Same-handed pitchers nearest on fastball velocity and shape, arm angle, extension, pitch mix, secondary shapes, Stuff, whiff rate and workload. 2026 regulars only.

Pitch locations · 2026

Where each pitch finishes, by batter side

Changeup 32%
35% zone
Four-seam 31%
51% zone
Sweeper 19%
50% zone
Sinker 11%
50% zone
Slider 6%
46% zone

Where each pitch finishes, catcher’s view. The bar marks the batter’s side; the box is an average strike zone. Pitches with 40+ thrown to this side.

Contract & projection

Club control (RosterResource) · Keystone projected WAR

2027 1.1 WAR Pre-arb $780K*
2028 1.1 WAR Pre-arb $803K*
2029 1.0 WAR Arbitration $2.6M*
2030 0.9 WAR Arbitration $4.8M*

* projected arbitration or minimum salary. Contract Studio →

Minor leagues

MLB Stats API · public box-score data

SeasonLevelLevelTeamAgeGPA / IPPA / IP ·Line
2025AAAAAADurham Bulls261686 IP 86 IP · 2.62 ERA · 29.2% K · 5.6% BB
Keystone is an independent portfolio project. It is not affiliated with Major League Baseball or any club. Data: MLB Stats API, Baseball Savant, FanGraphs. Used under their terms for individual, non-commercial use.