MLB Daily DeltaWeek 19 · August 3, 2026
Portrait of David Peterson
David Peterson
CHC · P
Change to
Germán Márquez
SD · 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 WHIP.

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

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

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
David Peterson
92.3
Germán Márquez
94.6
Swinging-Strike %lg 11.0% · higher = better
David Peterson
9.9%
Germán Márquez
9.1%
Strikeout %lg 22.0% · higher = better
David Peterson
18.8%
Germán Márquez
15.8%
Chase %lg 28.5% · higher = better
David Peterson
29.3%
Germán Márquez
26.2%
Hard-Hit % Allowedlg 40.0% · lower = better
David Peterson
42.5%
Germán Márquez
41.9%
Barrel % Allowedlg 8.0% · lower = better
David Peterson
7.1%
Germán Márquez
9.0%
xwOBA Allowedlg .315 · lower = better
David Peterson
.343
Germán Márquez
.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
4.286.18
lg xERA 4.10
now 5.18
4.70
Germán Márquez
4.286.18
lg xERA 4.10
now 5.76
4.84
WHIPlower is better
David Peterson
1.341.66
now 1.59
1.41
Germán Márquez
1.341.66
now 1.45
1.43

Volume · rest of season
Strikeoutshigher is better
David Peterson
4070.80
now 56
42
Germán Márquez
4070.80
now 19
28
Winshigher is better
David Peterson
.0006.60
now 3
13
Germán Márquez
.0006.60
now 3
25

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

If you already own them — trade angle
SellDavid Peterson — sell.conf 0.83
Sell HighGermán Márquez — sell high. His value is peaking; good time to trade him.conf 0.88
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