MLB Daily DeltaWeek 19 · July 31, 2026
Portrait of Dustin May
Dustin May
STL · P
Change to
Portrait of Luis Castillo
Luis Castillo
SEA · P
Change to
Who's more valuable, rest of season

Dustin May.

He projects to help you in more roto categories the rest of the way — ERA and WHIP.

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

Dustin May wins 2 categories (ERA, WHIP); Luis Castillo wins 1 (K); 1 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Dustin May
96.9
Luis Castillo
95.3
Swinging-Strike %lg 11.0% · higher = better
Dustin May
10.5%
Luis Castillo
12.4%
Strikeout %lg 22.0% · higher = better
Dustin May
23.1%
Luis Castillo
19.4%
Chase %lg 28.5% · higher = better
Dustin May
29.8%
Luis Castillo
32.9%
Hard-Hit % Allowedlg 40.0% · lower = better
Dustin May
46.1%
Luis Castillo
41.7%
Barrel % Allowedlg 8.0% · lower = better
Dustin May
6.5%
Luis Castillo
9.7%
xwOBA Allowedlg .315 · lower = better
Dustin May
.306
Luis Castillo
.337
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
Dustin May
3.286.17
lg xERA 4.10
now 4.57
3.92
Luis Castillo
3.286.17
lg xERA 4.10
now 5.53
4.59
WHIPlower is better
Dustin May
1.231.52
now 1.30
1.33
Luis Castillo
1.231.52
now 1.45
1.34

Volume · rest of season
Strikeoutshigher is better
Dustin May
4063.20
now 51
38
Luis Castillo
4063.20
now 56
48
Winshigher is better
Dustin May
.2003.80
now 3
13
Luis Castillo
.2003.80
now 2
12

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

If you already own them — trade angle
Buy LowDustin May — buy low. The dip is a window to acquire.conf 0.74
SellLuis Castillo — sell.conf 0.78
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