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Miles Mastrobuoni

2026
Mariners· 3B · bats L · throws R· 30 plate appearances

Grade

His grade shows how good he has been, and at what.
Fbetter than 7% of hitters at creating bases

He's running below his established level this season, so he has room to rebound.

Patient Contact

Works counts and puts the ball in play; modest slug.

Still searching for results at the plate

Miles Mastrobuoni walks at a league-average clip. He walks more often than 49% of qualified hitters. The overall production lags, though. Only 7% of qualified hitters create fewer estimated bases per plate appearance. This is an early read, on only 30 plate appearances so far.

30 plate appearances · data through 2026-09-27.

How to read this chart
Each spoke is a skill estimate adjusted for sample size, not a raw season stat, and farther out is better. A ↓ marks a stat where a lower number is better, and its spoke is flipped so farther out still means better. The middle ring marks the league median and the outer ring the league best. EB/PA is estimated bases, HR% home runs, BB% walks and K% strikeouts, each per plate appearance, and Hard-hit% is balls hit 95 mph or harder. Percentiles compare him with 534 qualified hitters, the ones with 50 or more plate appearances. He hasn't reached that bar himself, so he is measured against them rather than counted among them.

Plays like…

Each of these hitters shares his archetype and sits closest to him in EB/PA.

Hitter type

See what kind of hitter he is, next to the rest of the league.

Platoon splits

See how he hits left-handed and right-handed pitchers.

Platoon splits (EB/PA)

He hits righties better than lefties, by 0.075 EB/PA.

50% probable range: +0.048 to +0.101

vs LHP2 PA0.315

vs LHP: shrunk estimate 0.315 EB/PA, 50% probable range 0.280 to 0.348, based on 2 plate appearances. Raw (unshrunk) rate: 0.350 EB/PA. League median vs LHP: 0.424 EB/PA.

vs RHP28 PA0.390

vs RHP: shrunk estimate 0.390 EB/PA, 50% probable range 0.362 to 0.418, based on 28 plate appearances. Raw (unshrunk) rate: 0.275 EB/PA. League median vs RHP: 0.433 EB/PA.

0.2620.3090.3570.4040.452
← worsebetter →
Above league medianBelow50% probable rangeHis raw rateMiddle half of the league

His split is about typical for a lefty bat (median 0.078). He sits below the league median against both hands.

He sits in the league's bottom quarter vs both lefties and righties.

How to read this chart
  • Each dot is his estimate against that hand, with its 50% probable range as the bar. Higher is better.
  • The diamond is his raw rate, which small samples make noisy, so the simulator pulls the dot toward a more trustworthy value.
  • The dashed tick is the league median, and the shaded strip is the middle half of hitters with 50 or more plate appearances.
  • Tap or hover a mark for its number. LHP and RHP are left- and right-handed pitchers. More on the About page

How he hits

See what his contact is worth and what pitchers throw him.

He hits the ball up the middle most often, and that's where he does the most damage.

Best batted balls

Every ball Miles Mastrobuoni put in play this season is drawn where it landed.
How to read this chart
Dot color is estimated bases (EB), what the contact was worth no matter what the defense did with it. Darker means more bases, so a dark hollow ring in the outfield is a crushed ball that got caught. Tap or hover a dot or a row to link the two, and use the ▶ links to watch a play on Baseball Savant.

Performance by pitch type

2026 · 107 pitches

Each row shows the bases he adds per 100 pitches of one type, against the league.

← below league medianabove league median →
Four-Seam Fastball (50 pitches)
−6.0
Lg median −0.4Lg best +8.7
Other (57 pitches)

−3.9 bases per 100 · no single-type league comparison

Above league medianBelowMiddle half of the leagueLg medianLg best
How to read this chart
Each row is the bases he adds per 100 pitches of that type, on the same scale as the pitcher pages’ “saved/cost per 100” but from the hitter’s side. Every pitch counts. Taking a ball adds value, whiffing loses it, and the pitch that ends the plate appearance scores its outcome against what that count usually produces. A value of +3.5 means his results against that pitch have been worth about 3.5 extra bases per 100 seen. Higher is better. Types with fewer than 50 pitches seen pool into “Other”.

Best games

These are his biggest games this season.

Best games

These are his best games this season, ranked by bases above replacement.

Multi-season trends · Miles Mastrobuoni

Compared with last season, his HR% is down, his BB% is down and his K% is up.

Actual rates show what happened on the field, season by season.