MLB Daily DeltaWeek 17 · July 21, 2026
Portrait of Devin Williams
Devin Williams
NYM · P
Change to
Portrait of Riley O'Brien
Riley O'Brien
STL · P
Change to
Who's more valuable, rest of season

Devin Williams.

He projects to help you in more roto categories the rest of the way — strikeouts, ERA, and wins. Riley O'Brien’s box score looks better right now, but the luck-stripped projection flips it.

Head-to-head
K
ERA
WHIP
W
SV

Devin Williams wins 3 categories (K, ERA, W); Riley O'Brien wins 1 (SV); 1 even.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Devin Williams
93.9
Riley O'Brien
98.2
Swinging-Strike %lg 11.0% · higher = better
Devin Williams
17.6%
Riley O'Brien
12.1%
Strikeout %lg 22.0% · higher = better
Devin Williams
29.6%
Riley O'Brien
23.7%
Chase %lg 28.5% · higher = better
Devin Williams
38.3%
Riley O'Brien
29.3%
Hard-Hit % Allowedlg 40.0% · lower = better
Devin Williams
30.7%
Riley O'Brien
38.9%
Barrel % Allowedlg 8.0% · lower = better
Devin Williams
5.7%
Riley O'Brien
6.5%
xwOBA Allowedlg .315 · lower = better
Devin Williams
.291
Riley O'Brien
.323
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
Devin Williams
2.326.28
lg xERA 4.10
now 5.40
3.70
Riley O'Brien
2.326.28
lg xERA 4.10
now 3.20
3.73
WHIPlower is better
Devin Williams
.9001.77
now 1.55
1.24
Riley O'Brien
.9001.77
now 0.99
1.24

Volume · rest of season
Strikeoutshigher is better
Devin Williams
4040.60
now 31
35
Riley O'Brien
4040.60
now 27
22
Winshigher is better
Devin Williams
1.204.80
now 3
24
Riley O'Brien
1.204.80
now 3
23
Saveshigher is better
Devin Williams
119
now 8
510
Riley O'Brien
119
now 14
815
If you already own them — trade angle
Buy LowDevin Williams — buy low. The dip is a window to acquire.conf 0.90
Hold · wait & seeRiley O'Brien — hold.conf 0.50
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