MLB Daily DeltaWeek 17 · July 19, 2026
Portrait of Mason Miller
Mason Miller
SD · P
Change to
Portrait of Riley O'Brien
Riley O'Brien
STL · P
Change to
Who's more valuable, rest of season

Mason Miller.

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

Head-to-head
K
ERA
WHIP
W
SV

Mason Miller wins 4 categories (K, ERA, WHIP, SV); Riley O'Brien wins 1 (W).

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Mason Miller
101.3
Riley O'Brien
98.2
Swinging-Strike %lg 11.0% · higher = better
Mason Miller
22.5%
Riley O'Brien
12.1%
Strikeout %lg 22.0% · higher = better
Mason Miller
48.4%
Riley O'Brien
23.7%
Chase %lg 28.5% · higher = better
Mason Miller
37.8%
Riley O'Brien
29.3%
Hard-Hit % Allowedlg 40.0% · lower = better
Mason Miller
23.1%
Riley O'Brien
38.9%
Barrel % Allowedlg 8.0% · lower = better
Mason Miller
3.1%
Riley O'Brien
6.5%
xwOBA Allowedlg .315 · lower = better
Mason Miller
.178
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
Mason Miller
24.93
lg xERA 4.10
now 0.72
3.59
Riley O'Brien
24.93
lg xERA 4.10
now 3.20
3.73
WHIPlower is better
Mason Miller
.9001.40
now 0.84
1.23
Riley O'Brien
.9001.40
now 0.99
1.24

Volume · rest of season
Strikeoutshigher is better
Mason Miller
4059.40
now 49
38
Riley O'Brien
4059.40
now 27
23
Winshigher is better
Mason Miller
.0005.20
now 1
11
Riley O'Brien
.0005.20
now 3
24
Saveshigher is better
Mason Miller
3.6023.40
now 17
1019
Riley O'Brien
3.6023.40
now 14
815
If you already own them — trade angle
Hold · wait & seeMason Miller — hold.conf 0.50
Hold · wait & seeRiley O'Brien — hold.conf 0.50
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