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MLB Deserve-to-Win
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Jack Ralston

2026
Marlins· RHP · throws R· 17.1 IP· 5.71 ERA· 1.38 WHIP· 77 batters faced

Grade

His grade shows how good he has been, and at what.
Fbetter than 23% of qualified pitchers at limiting bases
RelieverStill Searching

Below league average across the board.

Ralston allows more bases than most pitchers

The simulator expects him to allow 0.470 bases per batter faced, better than 23% of qualified pitchers. His weakest skill is limiting home runs (1st percentile). Short relief outings push strikeout rates up a little, so read his K% spoke with that in mind.

His grade rests on 77 batters faced, with 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. Percentiles compare him with 517 qualified pitchers, those with 100+ batters faced, starters and relievers together. He has not reached that bar himself, so he is measured against them rather than counted among them.

Plays like…

Each of these pitchers shares his archetype and sits closest to him in xEB/PA.

Cameron FosterOriolesIsaac MattsonPiratesSeth JohnsonAthleticsJayden MurrayCubs

Pitcher type

This map shows what kind of pitcher he is, next to the league.

Arsenal

These cards show what he throws and what each pitch does.

Jack Ralston leans on his splitter (51% of pitches). His best pitch has been the four-seam fastball, saving 2.5 bases per 100 thrown against league average.

Pitch mix & swing-and-miss

+1 bases better than a replacement arm this season

He allowed about 39 estimated bases, against a replacement arm's 40 over the same batters faced.

Replacement level is per-batter and can't be split by pitch type, so the bars below use league average.

All pitches

He cost 5.9 bases against league average across 312 pitches, or 1.9 per 100 pitches.

Splitter
51%
82.5 mph · RHP median 86.9
23% whiffs · Lg median 34%
cost 3.1 per 1004.9 total
Four-Seam Fastball
27%
93.6 mph · RHP median 95.1
17% whiffs · Lg median 21%
saved 2.5 per 1002.1 total
Slider
22%
85.4 mph · RHP median 86.9
—
cost 4.5 per 1003.1 total
How to read this chart
Each row is a pitch he throws at least 3% of the time, from pitch tracking in the regular season. The bar is how often he throws it, then its average velocity and its whiff rate, the share of swings that miss. Beside the velocity and the whiff rate is the median for that pitch, among pitchers of his hand for velocity and across the league for whiffs. More whiffs are better for a pitcher, while usage and velocity describe how he pitches. The Bases vs average bars score each pitch against a league-average pitch in the same count, and a bar to the left (saved) is better.

Mix by batter side

Splitter
52% vs LHH · RHP median 32%
49% vs RHH · RHP median 16%
Four-Seam Fastball
24% vs LHH · RHP median 40%
32% vs RHH · RHP median 33%
How to read this chart
Each row shows how often he throws a pitch to left-handed hitters (LHH) and right-handed hitters (RHH), next to the median for pitchers of his hand (RHP median). Medians come from right-handed pitchers who throw that pitch at least 3% of the time. Between 45 and 384 of them qualify, depending on the pitch. A mix is a plan, so a higher or lower share is neither better nor worse. Overall results by batter side are under Platoon splits.

Jack Ralston's pitch movement, 2026

His Splitter has moved 2+ inches from its early-season shape, but his other 2 have not.

The verdict above compares each pitch with his own early-season outings in 2026, not with other pitchers, after taking out the league-wide drift in break.

Jack Ralston's pitch movement, 2026-60612061218in← glove sidearm side →more risemore drop
SplitterFS
Rise 2.2 in
−0.2 vs Lg median
Break 10.3 in
−0.5 vs Lg median
Vs. early season changed
Four-Seam FastballFF
Rise 18.0 in
+2.3 vs Lg median
Break 5.5 in
−2.2 vs Lg median
Vs. early season steady
SliderSL
Rise 0.5 in
−1.3 vs Lg median
Break −1.4 in
+2.3 vs Lg median
Vs. early season steady
Early season → nowLg medianNormal wobble around the dot
How to read this chart
Each dot is a pitch's current break in inches, averaged over his latest outings. Higher is more rise and further right is more arm-side break, and neither is better or worse. The faint trail runs from his early-season outings to the dot, and the soft halo shows how far normal noise can move it. League median is the small hollow ring, and a pitch marked * has none because too few pitchers throw it. The “changed” verdict removes a league-wide drift that the trail still shows, so a long trail can read as steady. The by-appearance chart below has the exact dates. More on the About page

By appearance

These charts follow his velocity, movement and mix from outing to outing.

These charts follow his velocity, movement and pitch mix one outing at a time, and each pitch keeps the same color in every chart. The velocity and movement charts also shade the middle of the league for scale.

Platoon splits

This section splits his results against lefties and righties.

Platoon splits (EB/PA allowed)

He handles righty bats better than lefty bats, by 0.042 EB/PA allowed.

50% probable range: +0.034 to +0.051

vs LHB53 PA0.445

vs LHB: shrunk estimate 0.445 EB/PA, 50% probable range 0.423 to 0.467, based on 53 plate appearances. Raw (unshrunk) rate: 0.526 EB/PA. League median vs LHB: 0.451 EB/PA.

His raw rate vs LHB (0.526) is off this scale. Small samples can push a raw rate this far, which is why the dot, the shrunk estimate, is the number to trust.

vs RHB24 PA0.403

vs RHB: shrunk estimate 0.403 EB/PA, 50% probable range 0.381 to 0.425, based on 24 plate appearances. Raw (unshrunk) rate: 0.539 EB/PA. League median vs RHB: 0.435 EB/PA.

His raw rate vs RHB (0.539) is off this scale. Small samples can push a raw rate this far, which is why the dot, the shrunk estimate, is the number to trust.

0.3710.3970.4240.4510.477
← betterworse →
Below league medianAbove50% probable rangeHis raw rateMiddle half of the league

His split is about typical for a righty arm (median 0.042). He allows less than the league median against both sides, so even his weaker side is a strength.

How to read this chart
  • Each dot is his estimate against that side, with its 50% probable range as the bar. These are bases allowed, so lower 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 pitchers with 100 or more batters faced.
  • The two splits average back to his modeled overall EB/PA allowed, not the xEB/PA headline.
  • Tap or hover a mark for its number. LHB and RHB are left- and right-handed batters. More on the About page

Contact allowed

These cards show what hitters do when they make contact.

Batters go to the pull side off him most often, and that's also where they do the most damage.

Pull side and opposite field depend on which side each batter hits from, so this pools every hitter he faced.

Batted balls allowed

Every ball hit off Jack Ralston this season is drawn where it landed.
hit · out
EBlowhigh
vs Corbin CarrollHome run
108 mph · 28° · worth 3.9 bases
09/14 vs D-backs
vs Seiya SuzukiHome run
106 mph · 29° · worth 3.7 bases
09/24 vs Cubs
vs Dominic SmithHome run
105 mph · 23° · worth 2.8 bases
09/26 vs Braves
vs Daylen LileHome run
102 mph · 27° · worth 2.7 bases
08/31 vs Nationals
vs Nolan ArenadoHome run
106 mph · 21° · worth 2.5 bases
09/16 vs D-backs

Luck check

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 his defense ran down. Tap or hover a dot or a row to link the two, and use the ▶ links to watch a play on Baseball Savant.

Best games

These are his biggest outings this season.

Best games

These are his best outings this season, ranked by bases saved against a replacement arm.