MLB Daily DeltaWeek 13 · June 24, 2026
Portrait of David Peterson
David Peterson
NYM · P
Change to
Portrait of Kumar Rocker
Kumar Rocker
TEX · 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); Kumar Rocker 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
92.3
Kumar Rocker
94.4
Swinging-Strike %lg 11.0% · higher = better
David Peterson
10.3%
Kumar Rocker
11.7%
Strikeout %lg 22.0% · higher = better
David Peterson
19.7%
Kumar Rocker
20.2%
Chase %lg 28.5% · higher = better
David Peterson
30.8%
Kumar Rocker
30.5%
Hard-Hit % Allowedlg 40.0% · lower = better
David Peterson
42.2%
Kumar Rocker
43.3%
Barrel % Allowedlg 8.0% · lower = better
David Peterson
6.7%
Kumar Rocker
7.6%
xwOBA Allowedlg .315 · lower = better
David Peterson
.340
Kumar Rocker
.335
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
2.885.84
lg xERA 4.10
now 5.18
4.57
Kumar Rocker
2.885.84
lg xERA 4.10
now 3.54
4.47
WHIPlower is better
David Peterson
1.211.70
now 1.59
1.44
Kumar Rocker
1.211.70
now 1.32
1.38

Volume · rest of season
Strikeoutshigher is better
David Peterson
4094.40
now 56
80
Kumar Rocker
4094.40
now 44
61
Winshigher is better
David Peterson
.4007.60
now 3
36
Kumar Rocker
.4007.60
now 2
24

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

If you already own them — trade angle
SellDavid Peterson — sell.conf 0.77
SellKumar Rocker — sell.conf 0.72
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