MLB Daily DeltaWeek 17 · July 20, 2026
Portrait of Aaron Nola
Aaron Nola
PHI · P
Change to
Portrait of Spencer Arrighetti
Spencer Arrighetti
HOU · P
Change to
Who's more valuable, rest of season

Aaron Nola.

He projects to help you in more roto categories the rest of the way — strikeouts, ERA, and WHIP. Spencer Arrighetti’s box score looks better right now, but it’s built on luck that won’t hold.

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

Aaron Nola wins 3 categories (K, ERA, WHIP); Spencer Arrighetti wins 1 (W); SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Aaron Nola
92.2
Spencer Arrighetti
92.4
Swinging-Strike %lg 11.0% · higher = better
Aaron Nola
12.8%
Spencer Arrighetti
10.9%
Strikeout %lg 22.0% · higher = better
Aaron Nola
23.9%
Spencer Arrighetti
23.1%
Chase %lg 28.5% · higher = better
Aaron Nola
32.6%
Spencer Arrighetti
26.3%
Hard-Hit % Allowedlg 40.0% · lower = better
Aaron Nola
39.6%
Spencer Arrighetti
30.9%
Barrel % Allowedlg 8.0% · lower = better
Aaron Nola
10.1%
Spencer Arrighetti
7.8%
xwOBA Allowedlg .315 · lower = better
Aaron Nola
.316
Spencer Arrighetti
.344
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
Aaron Nola
27.23
lg xERA 4.10
now 5.55
4.16
Spencer Arrighetti
27.23
lg xERA 4.10
now 1.34
4.72
WHIPlower is better
Aaron Nola
1.021.52
now 1.39
1.32
Spencer Arrighetti
1.021.52
now 1.13
1.41

Volume · rest of season
Strikeoutshigher is better
Aaron Nola
4072.40
now 64
58
Spencer Arrighetti
4072.40
now 43
50
Winshigher is better
Aaron Nola
.00014.60
now 3
24
Spencer Arrighetti
.00014.60
now 7
511

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

If you already own them — trade angle
Buy LowAaron Nola — buy low. The dip is a window to acquire.conf 0.90
Sell HighSpencer Arrighetti — sell high. His value is peaking; good time to trade him.conf 0.94
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