← BackJack Kochanowicz
LAA · RHP · 2026
60.7 IP · 295 BF · 1,106 pitches · 2026 season
HIGH Descriptive — not a forecast
107
Stuff+
79th percentile
104
ABStuff+
80th percentile
100
Pitching+
27th percentile
15.9%
K%
20th percentile
11.9%
BB%
24th percentile
5.38
FIP
37th percentile
Grades describe this season's stuff and run prevention. They are not forecasts: on clean season pairs the model has not beaten naive persistence (RESULTS-MLB §13), so nothing here projects next season.
Percentile rankings
vs 2026 graded MLB pitchers · 60.7 IP · 295 BF · 1,106 pitches · 2026 season
Stuff
Stuff+107
79th percentile
ABStuff+104
80th percentile
Whiff%22.4%
52th percentile
CSW%32.6%
43th percentile
Results
Pitching+100
27th percentile
RV/100-0.22
48th percentile
FIP5.38
37th percentile
RA/95.04
36th percentile
GB%57.2%
93th percentile
Command
K%15.9%
20th percentile
BB%11.9%
24th percentile
K-BB%4.1%
17th percentile
Velo92.8
89th percentile
How to read these
Each row is his rank, 1 to 99, among all graded MLB pitchers this season; the tick is the median. Green is good for him, red bad, whatever the stat's direction (a low FIP ranks high). Grey circles are descriptive rates with no good direction, and n= in place of a rank means too few events to rank. Grades are descriptive, not forecasts.
Percentile rankings
Raw plate discipline · vs 2026 graded MLB pitchers · 60.7 IP · 295 BF · 1,106 pitches · 2026 season
Swing & miss
Z-Whf%16.3%
73th percentile
O-Whf%36.7%
38th percentile
Chase%25.6%
20th percentile
Z-Con%83.7%
73th percentile
O-Con%63.3%
38th percentile
SwStr%25.7%
36th percentile
PutAwy%17.1%
50th percentile
Approach
Zone%47.1%
48th percentile
Z-Swg%67.2%
54th percentile, descriptive, no good or bad direction
Swing%45.2%
31th percentile
CS%19.7%
45th percentile
F-Str%43.4%
15th percentile
How to read these
Raw rates with this season's descriptive ranks. Sample-adjusted (shrunk) rankings are not shown yet: the reliability constants behind them were measured on college data and are being re-measured on MLB. Until then a small sample here is a small sample — hover the leaderboard column for its event count.
ArsenalKey columns; every column is on the Arsenal tab
Movement Profile
SI-4.1/+2.0CH-4.2/+3.9FF-1.9/+1.3SL-5.7/+1.7ring = slot expectation ±1σ/2σ · HB mirrored for LHP · descriptive
Release Traits
Height: 6.24 ft (±0.12)
Side: -1.42 ft (±0.19)
Extension: 6.33 ft
Season means; the ± is the SD across his pitches. Per-pitch release plots land in a later wave.
Batted Ball Against
Pitch
N_BIP
GB%
FB%
LD%
PU%
Avg EV
Avg LA
HrdHit%
SI
97
72.2
12.4
13.4
0.0
88.5
-2.4
54.6
CH
47
59.6
8.5
25.5
0.0
79.7
-0.6
27.7
FF
45
26.7
44.4
22.2
0.0
82.7
27.3
35.6
SL
19
47.4
26.3
21.1
0.0
81.6
12.6
36.8
Every pitch type he threw, ordered by balls in play. Rows under 5 BIP are dimmed rather than dropped — a slider put in play twice is a fact about the slider.
Arsenal
Pitches
4
23rd pct
Effective mix
3.8
54th pct
Separation
16.3
13th pct
Shape scatter
3.5 in
87th pct
Velo range
10.5 mph
29th pct
SI · CH · FF · SL
2026 season, 1,106 pitches; percentiles vs MLB pitchers with 100+ that season. A description of the arsenal, not a grade: none of these predicted next season beyond Pitching+ and his own prior year. For shape scatter a higher percentile is MORE scatter.
Run value by pitch2026 · measured
Pitch
Pitches
PA reach
RV/100
Lg avg
CH
257
157
-1.77
-0.07
FF
245
156
-0.31
-0.01
SI
424
236
+0.40
+0.27
SL
180
131
+0.67
+0.04
RV/100 is pitcher-positive (runs saved per 100 pitches). These are results: on a sample this size most of the gap between pitchers is the bounce of the ball, so the column never colours and never ranks a grade. The expected-value half of this card (xRV/100, locations, xwOBA) needs the run-value model and does not ship yet.
Location value
runs per 100 pitches vs league
Total
−0.16
24th percentile
Where he throws
−0.11
28th percentile
Which pitch there
−0.05
36th percentile
Heart28.3%
+174.27/100
Shadow41.2%
+115.87/100
Chase20.5%
−286.13/100
Waste10.0%
−497.23/100
What makes up the total
chase · SI8.1%−0.38
heart · SI11.9%+0.29
chase · FB4.0%−0.22
shadow · SI16.7%+0.21
shadow · CH9.7%+0.19
11 other locations−0.26
Total−0.16
Pitcher-positive, centred on the 2026 league mean (+0.01 RV/100). Ranks are descriptive: the year-to-year reliability of this mix on MLB has not been measured yet, so no cell is verdict-coloured. His actual run value minus this mix — execution — is deliberately not shown.