MLB Daily DeltaWeek 17 · July 19, 2026
Portrait of Aroldis Chapman
Aroldis Chapman
BOS · P
Change to
Portrait of Mason Miller
Mason Miller
SD · 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, wins, and saves.

Head-to-head
K
ERA
WHIP
W
SV

Mason Miller wins 5 categories (K, ERA, WHIP, W, SV); Aroldis Chapman wins 0 (none).

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Aroldis Chapman
96.9
Mason Miller
101.3
Swinging-Strike %lg 11.0% · higher = better
Aroldis Chapman
15.8%
Mason Miller
22.5%
Strikeout %lg 22.0% · higher = better
Aroldis Chapman
30.6%
Mason Miller
48.4%
Chase %lg 28.5% · higher = better
Aroldis Chapman
35.0%
Mason Miller
37.8%
Hard-Hit % Allowedlg 40.0% · lower = better
Aroldis Chapman
38.4%
Mason Miller
23.1%
Barrel % Allowedlg 8.0% · lower = better
Aroldis Chapman
8.2%
Mason Miller
3.1%
xwOBA Allowedlg .315 · lower = better
Aroldis Chapman
.256
Mason Miller
.178
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
Aroldis Chapman
24.99
lg xERA 4.10
now 0.48
3.70
Mason Miller
24.99
lg xERA 4.10
now 0.72
3.59
WHIPlower is better
Aroldis Chapman
.9001.40
now 0.86
1.24
Mason Miller
.9001.40
now 0.84
1.23

Volume · rest of season
Strikeoutshigher is better
Aroldis Chapman
4058.60
now 25
31
Mason Miller
4058.60
now 49
38
Winshigher is better
Aroldis Chapman
.0001.48
now 0
00
Mason Miller
.0001.48
now 1
11
Saveshigher is better
Aroldis Chapman
523
now 12
917
Mason Miller
523
now 17
1019
If you already own them — trade angle
Hold · wait & seeAroldis Chapman — hold.conf 0.50
Hold · wait & seeMason Miller — hold.conf 0.50
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