MLB Daily DeltaWeek 19 · July 30, 2026
Portrait of Luis Castillo
Luis Castillo
SEA · P
Change to
Portrait of Zebby Matthews
Zebby Matthews
MIN · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 11, 2 even. Take whoever fills a bigger need.

Head-to-head
K
ERA
WHIP
W
SV n/a

Luis Castillo wins 1 (K); Zebby Matthews 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
Luis Castillo
95.3
Zebby Matthews
95.2
Swinging-Strike %lg 11.0% · higher = better
Luis Castillo
12.4%
Zebby Matthews
10.3%
Strikeout %lg 22.0% · higher = better
Luis Castillo
19.4%
Zebby Matthews
18.5%
Chase %lg 28.5% · higher = better
Luis Castillo
32.9%
Zebby Matthews
27.6%
Hard-Hit % Allowedlg 40.0% · lower = better
Luis Castillo
41.7%
Zebby Matthews
37.6%
Barrel % Allowedlg 8.0% · lower = better
Luis Castillo
9.7%
Zebby Matthews
12.0%
xwOBA Allowedlg .315 · lower = better
Luis Castillo
.337
Zebby Matthews
.334
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
Luis Castillo
4.135.93
lg xERA 4.10
now 5.53
4.59
Zebby Matthews
4.135.93
lg xERA 4.10
now 4.63
4.53
WHIPlower is better
Luis Castillo
.9001.62
now 1.45
1.34
Zebby Matthews
.9001.62
now 1.03
1.34

Volume · rest of season
Strikeoutshigher is better
Luis Castillo
4068.80
now 56
49
Zebby Matthews
4068.80
now 24
48
Winshigher is better
Luis Castillo
.5202.48
now 2
12
Zebby Matthews
.5202.48
now 1
12

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

If you already own them — trade angle
SellLuis Castillo — sell.conf 0.78
SellZebby Matthews — sell.conf 0.75
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