Players / Player profile
MIL · C

Bo Naylor

Age 26 B/T L/R 5′9″, 205 lb Canada MLB debut 2022
40-man
  • Milwaukee’s roster as it stands on the 40-man, off the 26-man (call-up depth)
  • Trade read Available at a price: MIL 81% playoff odds; control through 2029.
xwOBA .293 wOBA .224
2026 fWAR −0.4
Projected 2027 WAR 0.7 Keystone Marcel+ at 290 PA

Hitting · 2026

96 PA: percentiles need 300+, so values only

xwOBA .293 xwOBA: .293
Swing decisions −0.28 Swing decisions: −0.28
Contact value +0.72 Contact value: +0.72
Bat speed 71.9 Bat speed: 71.9
Squared-up / swing 21% Squared-up / swing: 21%
Blasts / swing 8% Blasts / swing: 8%
EV90 102.9 EV90: 102.9
Barrel % 12.3% Barrel %: 12.3%
Chase % 26.7% Chase %: 26.7%
Zone contact 93.8% Zone contact: 93.8%
Strikeout % 25.0% Strikeout %: 25.0%
Walk % 7.3% Walk %: 7.3%

Platoon splits · swing path

By pitcher handedness

vsPAwOBAxwOBAK%BB%ChaseDecisionsContact
LHP14.307.22021%0%23%+0.65−0.69
RHP82.210.30626%9%27%−0.45+0.96
Attack angle
10.3° (50% in 5–20°)
Attack direction
−6.3°
Swing length
7.6 ft
Fast-swing rate
13%
Pull-air %
23.1%
Hard-hit %
41.5%
Slash · wRC+
.154/.214/.275 · 35

Zone map · 2026

Where he does damage, and where to pitch him

+1.0−1.9−0.6−2.0−0.1−0.2−0.7−1.9−0.9+0.4+0.7−3.7−3.7−3.5+2.4+0.7−1.5+4.1+1.8−1.7+0.2−0.2−0.4+1.5−1.4LHB

Does the most damage down over the middle (+4.1 vs. league per 100; 1.9 standard errors on 21 pitches, inside the noise for the best of nine cells).

Weakest middle-middle (−3.7), but only 1.6 standard errors from average on 29 pitches: no in-zone spot to attack yet.

Runs per 100 pitches vs. an average LHB: better · worse. Catcher’s view · 394 pitches · faded cells are within one standard error of average. A spot is called only when it is farther from average than the best or worst of nine average cells gets 95% of the time (set from the league’s own pitches: about 3 standard errors above, 2 below).

Fielding

2027 rating at every position he can play · OAA by position · range by direction · tools. Same engine as the Fielding Lab and the Winter Plan.

2027 rating by position · best fit first, on the total with the position’s worth
C +1.4 +13.9
1B −2.0prior −17.5
Outs Above Average by position
SeasonPosOAARangeArm, DPRunsBatters
No MLB fielding yet.

Runs = range plus his arm and double-play runs spread over his positions by outs (Fielding Run Value, from 2023): what the rating counts.

Range by direction (OAA)

No directional data (needs a qualified season at one position).

Tools (percentile among MLB fielders)
Arm strength —
Sprint speed 27.4 ft/s · 49th
Zone rating (Keystone expected outs)
SeasonZoneBallsOuts vs. exp.
Too few balls in his zone.

The zone rating counts every ball hit to his part of the field while he played there, his club’s positioning included; Savant OAA uses his actual starting spot and is the better individual grade. They agree best in the outfield. See the model card.

Compare in the Fielding Lab →

Contract & projection

Club control (RosterResource) · Keystone projected WAR

2027 0.7 WAR Arbitration $1.4M*
2028 0.6 WAR Arbitration $3.2M*
2029 0.5 WAR Arbitration $5.5M*
2030 0.3 WAR Free agent

* projected arbitration or minimum salary. Contract Studio →

Minor leagues

MLB Stats API · public box-score data

SeasonLevelLevelTeamAgeGPA / IPPA / IP ·Line
2026AAAAAANashville Sounds2659257 PA 257 PA · .241/.346/.468 · 11 HR · 24.1% K · 13.6% BB
2026ROKROKACL Guardians2615 PA 5 PA · .200/.200/.400 · 0 HR · 40.0% K · 0.0% BB

ABS challenges · 2026

Baseball Savant

As batter 33% 1/3 won · −0.4 runs
As catcher 40% 6/15 won · −1.1 runs
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.