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Jonathan Loáisiga

2026
D-backs· RHP · throws R· 67.0 IP· 2.42 ERA· 1.03 WHIP· 261 batters faced
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Grade

His grade shows how good he has been, and at what.
A+better than 90% of qualified pitchers at limiting bases
RelieverCommand Artist

Rarely walks anyone and lets the defense work.

Loáisiga is among the league's best at limiting bases

The simulator expects him to allow 0.418 bases per batter faced, better than 90% of qualified pitchers. His best skill is limiting walks (95th percentile). His weakest skill is getting strikeouts (18th percentile). Short relief outings push strikeout rates up a little, so read his K% spoke with that in mind.

His grade rests on 261 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.

Plays like…

Each of these pitchers shares his archetype and sits closest to him in xEB/PA. Pick one to see him side by side with Jonathan Loáisiga.

Keider MonteroTigersJake BennettRed SoxLogan WebbGiantsTyler AlexanderRangers

Pitcher type

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

Pitcher type

He lands in the “Misses bats, limits hard contact” corner of the map.

League best:K% − BB% Jacob Misiorowski (26.8%)Hard-hit% allowed Blake Snell (29.0%)

How to read this chart
Two skills separate pitching styles: strikeout rate minus walk rate, where higher is better, and hard-hit rate allowed, where lower is better. The hard-hit axis is flipped, so the best corner is the top right. Each dot is a pitcher with 80+ batters faced this season, sized by batters faced. The dashed lines are the league median on each skill, and the league best on each is named above the chart. Click any dot to open that pitcher's page.
 Jonathan LoáisigaLeague medianPercentile
Bases per ball in play(lower = better).406.527—
Walk rate(lower = better)6%9%95th
Strikeout rate(higher = better)20%22%18th

A higher percentile is better, and the 99th is the top of the league.

Arsenal

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

Jonathan Loáisiga mixes his sinker (35%) and changeup (27%). His best pitch has been the sinker, saving 6.3 bases per 100 thrown against league average, and his sinker runs 3.2 mph faster than the median right-handed pitcher's.

Pitch mix & swing-and-miss

+40 bases better than a replacement arm this season

He allowed about 96 estimated bases, against a replacement arm's 136 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 saved 24.9 bases against league average across 962 pitches, or 2.6 per 100 pitches.

Sinker
35%
97.9 mph · RHP median 94.7
17% whiffs · Lg median 13%
saved 6.3 per 10021.2 total
Changeup
27%
91.0 mph · RHP median 87.1
32% whiffs · Lg median 30%
cost 1.6 per 1004.3 total
Four-Seam Fastball
17%
97.5 mph · RHP median 95.1
20% whiffs · Lg median 21%
saved 3.2 per 1005.2 total
Curveball
15%
89.5 mph · RHP median 81.2
26% whiffs · Lg median 29%
saved 1.3 per 1001.9 total
Cutter
6%
95.7 mph · RHP median 90.1
—
saved 1.6 per 1000.9 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

Compared with the league, his sinker tilts 21 points more toward righties.

Sinker
16% vs LHH · RHP median 16%
55% vs RHH · RHP median 33%
Changeup
45% vs LHH · RHP median 30%
9% vs RHH · RHP median 12%
Four-Seam Fastball
26% vs LHH · RHP median 40%
8% 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 114 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.

Jonathan Loáisiga's pitch movement, 2026

His Cutter has moved 2+ inches from its early-season shape, but his other 4 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.

Jonathan Loáisiga's pitch movement, 2026012-12012in← glove sidearm side →more risemore drop
SinkerSI
Rise 6.4 in
−1.9 vs Lg median
Break 16.7 in
+1.5 vs Lg median
Vs. early season steady
ChangeupCH
Rise 5.7 in
+1.6 vs Lg median
Break 16.2 in
+2.0 vs Lg median
Vs. early season steady
Four-Seam FastballFF
Rise 12.9 in
−2.8 vs Lg median
Break 10.1 in
+2.4 vs Lg median
Vs. early season steady
CurveballCU
Rise −1.8 in
+8.7 vs Lg median
Break −3.2 in
+5.4 vs Lg median
Vs. early season steady
CutterFC
Rise 8.7 in
+1.0 vs Lg median
Break 4.9 in
+7.0 vs Lg median
Vs. early season changed
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 0.044 EB/PA allowed.

50% probable range: +0.036 to +0.052

vs LHB133 PA0.446

vs LHB: shrunk estimate 0.446 EB/PA, 50% probable range 0.428 to 0.465, based on 133 plate appearances. Raw (unshrunk) rate: 0.453 EB/PA. League median vs LHB: 0.451 EB/PA.

vs RHB128 PA0.402

vs RHB: shrunk estimate 0.402 EB/PA, 50% probable range 0.383 to 0.421, based on 128 plate appearances. Raw (unshrunk) rate: 0.271 EB/PA. League median vs RHB: 0.435 EB/PA.

His raw rate vs RHB (0.271) 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.

0.3730.3980.4240.4500.475
← 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 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 Jonathan Loáisiga this season is drawn where it landed.
hit · out
EBlowhigh
vs Kyle TuckerHome run
98 mph · 32° · worth 3.5 bases
08/08 vs Dodgers
vs CJ AbramsHome run
104 mph · 24° · worth 3.1 bases
07/26 vs Nationals
vs Tyler BlackDouble
99 mph · 24° · worth 3.0 bases
04/30 vs Brewers
vs Oneil CruzOutLucky out
108 mph · 23° · worth 2.7 bases
05/05 vs Pirates
vs Drew GilbertDouble
110 mph · 10° · worth 1.8 bases
05/25 vs Giants

Luck check

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

vs Oneil CruzOutLucky out
108 mph · 23° · worth 2.7 bases
05/05 vs Pirates
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.

Deserved vs. actual

Batters have been credited with about the bases their contact off Jonathan Loáisiga deserved.

Deserved by the contact he allowed81
Actually credited to batters78

Both bars count 199 balls in play, with walks and strikeouts left out.

How to read this chart
Every ball in play is worth the bases its exit velocity, launch angle and direction usually produce. If batters were credited with more than that, his results have been unlucky, and fewer means lucky. BABIP against is the batting average on balls in play he allows, next to the league median.

ERA 2.42 · WHIP 1.03 · BABIP against 0.270 (Lg median 0.286)

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 · Jonathan Loáisiga

Compared with last season, his xEB/PA is down, his HR allowed% is down, his BB% is down, his Barrel% against is down, his Hard-hit% against is down, his GB% against is up and his Pull% against is down.

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