MLB Daily DeltaWeek 19 · August 5, 2026
Portrait of David Peterson
David Peterson
CHC · P
Change to
Portrait of Ryne Nelson
Ryne Nelson
AZ · P
Change to
Who's more valuable, rest of season

David Peterson.

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

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

David Peterson wins 3 categories (K, ERA, W); Ryne Nelson wins 1 (WHIP); SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
David Peterson
92.3
Ryne Nelson
96.3
Swinging-Strike %lg 11.0% · higher = better
David Peterson
9.9%
Ryne Nelson
11.4%
Strikeout %lg 22.0% · higher = better
David Peterson
18.8%
Ryne Nelson
17.5%
Chase %lg 28.5% · higher = better
David Peterson
29.3%
Ryne Nelson
34.1%
Hard-Hit % Allowedlg 40.0% · lower = better
David Peterson
42.5%
Ryne Nelson
43.4%
Barrel % Allowedlg 8.0% · lower = better
David Peterson
7.1%
Ryne Nelson
10.2%
xwOBA Allowedlg .315 · lower = better
David Peterson
.343
Ryne Nelson
.349
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
David Peterson
4.495.40
lg xERA 4.10
now 5.18
4.71
Ryne Nelson
4.495.40
lg xERA 4.10
now 4.82
4.84
WHIPlower is better
David Peterson
1.031.75
now 1.59
1.41
Ryne Nelson
1.031.75
now 1.19
1.28

Volume · rest of season
Strikeoutshigher is better
David Peterson
4064.80
now 56
40
Ryne Nelson
4064.80
now 52
34
Winshigher is better
David Peterson
.2003.80
now 3
13
Ryne Nelson
.2003.80
now 2
12

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

If you already own them — trade angle
SellDavid Peterson — sell.conf 0.83
SellRyne Nelson — sell.conf 0.89
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