MLB Daily DeltaWeek 18 · July 27, 2026
Portrait of Caleb Kilian
Caleb Kilian
SF · P
Change to
Portrait of Jack Perkins
Jack Perkins
ATH · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 22, 1 even. Take whoever fills a bigger need.

Head-to-head
K
ERA
WHIP
W
SV

Caleb Kilian wins 2 (ERA, WHIP); Jack Perkins wins 2 (K, W); 1 even.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Caleb Kilian
96.8
Jack Perkins
96.0
Swinging-Strike %lg 11.0% · higher = better
Caleb Kilian
13.6%
Jack Perkins
13.4%
Strikeout %lg 22.0% · higher = better
Caleb Kilian
27.1%
Jack Perkins
26.7%
Chase %lg 28.5% · higher = better
Caleb Kilian
32.2%
Jack Perkins
33.6%
Hard-Hit % Allowedlg 40.0% · lower = better
Caleb Kilian
34.8%
Jack Perkins
38.1%
Barrel % Allowedlg 8.0% · lower = better
Caleb Kilian
7.1%
Jack Perkins
7.9%
xwOBA Allowedlg .315 · lower = better
Caleb Kilian
.283
Jack Perkins
.316
stabilized — trust it · small sample yet · dashed = league avg · right = better
05

The tape

Rest-of-season projection · bold = leads
rest-of-season projection current season projection range
Rate · earned-run quality
ERAlower is better
Caleb Kilian
2.976.17
lg xERA 4.10
now 3.81
3.68
Jack Perkins
2.976.17
lg xERA 4.10
now 5.46
4.03
WHIPlower is better
Caleb Kilian
1.081.35
now 1.15
1.25
Jack Perkins
1.081.35
now 1.21
1.28

Volume · rest of season
Strikeoutshigher is better
Caleb Kilian
4039
now 29
18
Jack Perkins
4039
now 33
25
Winshigher is better
Caleb Kilian
.5202.48
now 2
12
Jack Perkins
.5202.48
now 2
12
Saveshigher is better
Caleb Kilian
.6004.40
now 3
23
Jack Perkins
.6004.40
now 3
23
If you already own them — trade angle
Hold · wait & seeCaleb Kilian — hold.conf 0.50
Buy LowJack Perkins — buy low. The dip is a window to acquire.conf 0.90
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