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Joe Rock

2026
Athletics· LHP · throws L· 10.1 IP· 5.23 ERA· 2.42 WHIP· 56 batters faced

Grade

His grade shows how good he has been, and at what.
Fbetter than 6% of qualified pitchers at limiting bases
StarterPower Arm

Misses bats in bunches; lives with the walks.

Rock allows more bases than most pitchers

The simulator expects him to allow 0.489 bases per batter faced, better than 6% of qualified pitchers. His best skill is limiting home runs (95th percentile). His weakest skill is limiting walks (3rd percentile).

His grade rests on 56 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.

Jack SinclairNationalsRobert StockMetsCarson PalmquistNationalsDrey JamesonD-backs

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.

Joe Rock leans on his four-seam fastball (49% of pitches). His slider has performed closest to league average.

Pitch mix & swing-and-miss

+13 bases better than a replacement arm this season

He allowed about 20 estimated bases, against a replacement arm's 33 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 2.5 bases against league average across 183 pitches, or 1.4 per 100 pitches.

Four-Seam Fastball
49%
93.4 mph · LHP median 93.5
26% whiffs · Lg median 21%
cost 2.5 per 1002.6 total
Slider
37%
84.9 mph · LHP median 85.6
34% whiffs · Lg median 33%
saved 0.2 per 1000.1 total
Sinker
not charted
10%
93.7 mph · LHP median 92.9
—
—
Changeup
not charted
3%
87.6 mph · LHP median 85.1
—
—

His sinker and changeup aren't in the charts below, because too few of each were tracked this season.

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

Four-Seam Fastball
50% vs LHH · LHP median 34%
48% vs RHH · LHP median 41%
Slider
42% vs LHH · LHP median 33%
32% vs RHH · LHP median 18%
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 (LHP median). Medians come from left-handed pitchers who throw that pitch at least 3% of the time. Between 103 and 149 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.

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. His sinker and changeup aren't in these charts, because too few of each were tracked this season.

Platoon splits

This section splits his results against lefties and righties.

Platoon splits (EB/PA allowed)

He handles lefty bats better than righty bats, by 0.037 EB/PA allowed.

50% probable range: +0.029 to +0.046

vs LHB32 PA0.505

vs LHB: shrunk estimate 0.505 EB/PA, 50% probable range 0.481 to 0.528, based on 32 plate appearances. Raw (unshrunk) rate: 0.533 EB/PA. League median vs LHB: 0.451 EB/PA.

vs RHB24 PA0.543

vs RHB: shrunk estimate 0.543 EB/PA, 50% probable range 0.520 to 0.565, based on 24 plate appearances. Raw (unshrunk) rate: 0.418 EB/PA. League median vs RHB: 0.435 EB/PA.

His raw rate vs RHB (0.418) 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.

0.4190.4600.5000.5400.581
← betterworse →
Below league medianAbove50% probable rangeHis raw rateMiddle half of the league

His split is about typical for a lefty arm (median 0.038). He allows more than the league median against both sides.

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 up the middle off him most often, but they do the most damage to the pull side.

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 Joe Rock this season is drawn where it landed.
hit · out
EBlowhigh
vs Kevin McGonigleOutLucky out
96 mph · 12° · worth 2.0 bases
06/20 vs Tigers
vs Jake RogersSingle
103 mph · 15° · worth 1.6 bases
06/20 vs Tigers
vs Paul GoldschmidtSingle
101 mph · 12° · worth 1.1 bases
06/16 vs Yankees
vs José CaballeroSingle
92 mph · 13° · worth 1.0 bases
06/16 vs Yankees
vs Kevin McGonigleSingle
103 mph · 11° · worth 0.9 bases
06/20 vs Tigers

Luck check

One out behind him came on a ball the simulator values at 1.5 bases or more.

vs Kevin McGonigleOutLucky out
96 mph · 12° · worth 2.0 bases
06/20 vs Tigers
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.

Multi-season trends · Joe Rock

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

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