MLB Daily DeltaWeek 25 · September 10, 2026
Portrait of David Peterson
David Peterson
CHC · P
Change to
Robert Stock
NYM · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 22. Take whoever fills a bigger need.

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

David Peterson wins 2 (K, W); Robert Stock wins 2 (ERA, WHIP); SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
David Peterson
92.5
Robert Stock
95.7
Swinging-Strike %lg 11.0% · higher = better
David Peterson
10.2%
Robert Stock
12.1%
Strikeout %lg 22.0% · higher = better
David Peterson
19.5%
Robert Stock
19.7%
Chase %lg 28.5% · higher = better
David Peterson
28.6%
Robert Stock
29.0%
Hard-Hit % Allowedlg 40.0% · lower = better
David Peterson
40.6%
Robert Stock
31.4%
Barrel % Allowedlg 8.0% · lower = better
David Peterson
6.2%
Robert Stock
7.0%
xwOBA Allowedlg .315 · lower = better
David Peterson
.341
Robert Stock
.327
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
26.53
lg xERA 4.10
now 5.18
4.67
Robert Stock
26.53
lg xERA 4.10
now 1.80
4.10
WHIPlower is better
David Peterson
.9001.99
now 1.59
1.47
Robert Stock
.9001.99
now 0.60
1.30

Volume · rest of season
Strikeoutshigher is better
David Peterson
4076.80
now 56
12
Robert Stock
4076.80
now 4
9
Winshigher is better
David Peterson
.0004.20
now 3
01
Robert Stock
.0004.20
now 0
00

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

If you already own them — trade angle
SellDavid Peterson — sell.conf 0.81
Hold · wait & seeRobert Stock — hold.conf 0.55
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