MLB Daily DeltaWeek 27 · September 27, 2026
Jake Irvin
WSH · P
Change to
Portrait of Luis Castillo
Luis Castillo
CWS · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 1–1, 2 even. Take whoever fills a bigger need.

Head-to-head
K
ERA
▶
◀
WHIP
W
SV n/a

Jake Irvin wins 1 (WHIP); Luis Castillo wins 1 (ERA); 2 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Jake Irvin
93.2
Luis Castillo
95.2
Swinging-Strike %lg 11.0% · higher = better
Jake Irvin
11.1%
Luis Castillo
12.3%
Strikeout %lg 22.0% · higher = better
Jake Irvin
23.3%
Luis Castillo
18.9%
Chase %lg 28.5% · higher = better
Jake Irvin
24.8%
Luis Castillo
31.5%
Hard-Hit % Allowedlg 40.0% · lower = better
Jake Irvin
44.6%
Luis Castillo
41.8%
Barrel % Allowedlg 8.0% · lower = better
Jake Irvin
10.8%
Luis Castillo
9.6%
xwOBA Allowedlg .315 · lower = better
Jake Irvin
.346
Luis Castillo
.341
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
Jake Irvin
4.375.86
lg xERA 4.10
now 5.23
4.81
Luis Castillo
4.375.86
lg xERA 4.10
now 5.53
4.70
WHIPlower is better
Jake Irvin
1.281.52
now 1.35
1.36
Luis Castillo
1.281.52
now 1.45
1.38

Volume · rest of season
Strikeoutshigher is better
Jake Irvin
4081.20
now 58
0
Luis Castillo
4081.20
now 56
0
Winshigher is better
Jake Irvin
.0002.80
now 2
0–0
Luis Castillo
.0002.80
now 2
0–0

SV — not applicable. Both pitch out of the rotation.

If you already own them — trade angle
SellJake Irvin — sell.conf 0.88
Hold · leans sellLuis Castillo — hold.conf 0.60
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