Players / Player profile
BOS · SS

Andruw Monasterio

Age 29 B/T R/R 5′11″, 195 lb Venezuela MLB debut 2023
40-man
  • Trade read Available at a price: BOS 76% playoff odds; control through 2029.
xwOBA .289 wOBA .300
2026 fWAR −0.6
Projected 2027 WAR −0.2 Keystone Marcel+ at 387 PA

Hitting · 2026 percentiles

vs. MLB hitters with 300+ PA · 345 PA

xwOBA .289 xwOBA: .289, 13th percentile
Swing decisions +1.09 Swing decisions: +1.09, 90th percentile
Contact value −0.98 Contact value: −0.98, 16th percentile
Bat speed 69.6 Bat speed: 69.6, 18th percentile
Squared-up / swing 24% Squared-up / swing: 24%, 62nd percentile
Blasts / swing 5% Blasts / swing: 5%, 18th percentile
EV90 101.2 EV90: 101.2, 14th percentile
Barrel % 6.5% Barrel %: 6.5%, 38th percentile
Chase % 26.6% Chase %: 26.6%, 69th percentile
Zone contact 88.8% Zone contact: 88.8%, 78th percentile
Strikeout % 19.7% Strikeout %: 19.7%, 61st percentile
Walk % 7.5% Walk %: 7.5%, 32nd percentile

Platoon splits · swing path

By pitcher handedness

vsPAwOBAxwOBAK%BB%ChaseDecisionsContact
LHP129.337.34619%11%23%+2.27+0.34
RHP216.279.25520%6%29%+0.30−1.85
Attack angle
10.8° (56% in 5–20°)
Attack direction
−4.1°
Swing length
6.9 ft
Fast-swing rate
3%
Pull-air %
18.1%
Hard-hit %
31.4%
Slash · wRC+
.233/.295/.371 · 83

Zone map · 2026

Where he does damage, and where to pitch him

+1.0−0.6−1.6−0.4−0.4+2.0−2.6−1.7−2.5−1.1+3.0−2.9−0.5−2.60.0+0.2+4.8+0.8+1.2+0.7+1.0+3.8−1.0−1.8+0.8RHB

Does the most damage down and in (+4.8 vs. league per 100; 2.1 standard errors on 44 pitches, inside the noise for the best of nine cells).

Weakest middle-in (−2.9), but only 1.3 standard errors from average on 62 pitches: no in-zone spot to attack yet.

Runs per 100 pitches vs. an average RHB: better · worse. Catcher’s view · 1,370 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).

Most similar hitters

Swings like Monasterio: bat path, contact quality and approach

SimilarityPlayerxwOBA’26 WAR’27 proj2027
70Travis Bazzana CLE · ’02.3002.82.4Pre-arb
68Carson Kelly CHC · ’94.3101.61.7Free agent
67Austin Hedges CLE · ’92.2901.00.5Free agent
67TJ Friedl CIN · ’95.260−0.70.5Free agent
66Dominic Smith ATL · ’95.301−0.5−0.2Free agent

Carson Kelly (similarity 68, 1.7 WAR projected for 2027) is a free agent this winter: a similar swing available without trading talent, at a free agent’s price. Opportunity Finder →

Nearest neighbours on bat speed, swing length, attack angle, squared-up and blast rates, EV90, barrels, pull-air, chase, zone contact, K% and BB%. 2026 regulars only.

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
SS −5.3 +2.2
3B −4.9 −5.4
2B −6.2 −6.7
1B +0.6 −14.9
Outs Above Average by position
SeasonPosOAARangeArm, DPRunsBatters
20263B000.00.0106
20261B−3−2+0.1−1.9291
20262B−3−2+0.1−1.9478
2026SS−9−7+0.3−6.81,893
20251B+10+0.3+0.385
20253B+1+1+0.1+1.1185
20252B00+0.1+0.1294
2025SS00+0.2+0.2838
2024LF000.00.07
20241B00+0.1+0.174
20242B−1−1+0.4−0.6527
20243B−3−3+0.6−2.4695
2023SS−1−10.0−1.0155
20232B−1−1+0.2−0.8812
20233B+2+1+0.5+1.51,840

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 at SS)
2025 · SS2026 · SS In (charging) 0−4Back 0−2Toward 3B line +3−3Toward 1B line −2−6vs. RHH −2−11vs. LHH +3−4

At SS in 2026, the biggest loss came toward 1B line (−6 outs): a coaching target.

Tools (percentile; arm among SSs)
Arm at SS 80.2 mph · 7th
Sprint speed 27.2 ft/s · 46th
Zone rating (Keystone expected outs)
SeasonZoneBallsOuts vs. exp.
2026SS184−8.1
20262B56−0.6
2025SS66−2.1
20243B65+1.3
20242B41+0.1

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 −0.2 WAR Arbitration $1.1M*
2028 −0.5 WAR Arbitration $1.2M*
2029 −0.9 WAR Arbitration $1.2M*
2030 −1.3 WAR Free agent

* projected arbitration or minimum salary. Contract Studio →

Minor leagues

MLB Stats API · public box-score data

SeasonLevelLevelTeamAgeGPA / IPPA / IP ·Line
2025AAAAAANashville Sounds2830130 PA 130 PA · .250/.346/.411 · 4 HR · 23.8% K · 12.3% BB

ABS challenges · 2026

Baseball Savant

As batter 17% 1/6 won · −0.9 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.