MLB Daily DeltaWeek 27 · September 29, 2026
Portrait of David Peterson
David Peterson
CHC · P
Change to
Jake Irvin
WSH · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 1–1, 2 even. Take whoever fills a bigger need.

Head-to-head
K
◀
ERA
WHIP
▶
W
SV n/a

David Peterson wins 1 (ERA); Jake Irvin wins 1 (WHIP); 2 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
David Peterson
92.5
Jake Irvin
93.2
Swinging-Strike %lg 11.0% · higher = better
David Peterson
10.5%
Jake Irvin
11.2%
Strikeout %lg 22.0% · higher = better
David Peterson
20.7%
Jake Irvin
23.4%
Chase %lg 28.5% · higher = better
David Peterson
28.8%
Jake Irvin
25.0%
Hard-Hit % Allowedlg 40.0% · lower = better
David Peterson
39.6%
Jake Irvin
44.9%
Barrel % Allowedlg 8.0% · lower = better
David Peterson
6.3%
Jake Irvin
10.9%
xwOBA Allowedlg .315 · lower = better
David Peterson
.333
Jake Irvin
.351
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
4.255.51
lg xERA 4.10
now 5.18
4.53
Jake Irvin
4.255.51
lg xERA 4.10
now 5.23
4.93
WHIPlower is better
David Peterson
1.251.69
now 1.59
1.44
Jake Irvin
1.251.69
now 1.35
1.36

Volume · rest of season
Strikeoutshigher is better
David Peterson
4081.20
now 56
0
Jake Irvin
4081.20
now 58
0
Winshigher is better
David Peterson
.0004.20
now 3
0–0
Jake Irvin
.0004.20
now 2
0–0

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

If you already own them — trade angle
SellDavid Peterson — sell.conf 0.75
SellJake Irvin — sell.conf 0.90
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