MLB Daily DeltaWeek 15 · July 4, 2026
Portrait of David Peterson
David Peterson
CHC · P
Change to
Portrait of Kyle Leahy
Kyle Leahy
STL · 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, ERA); Kyle Leahy wins 2 (WHIP, 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
Kyle Leahy
94.1
Swinging-Strike %lg 11.0% · higher = better
David Peterson
10.0%
Kyle Leahy
10.0%
Strikeout %lg 22.0% · higher = better
David Peterson
19.2%
Kyle Leahy
18.7%
Chase %lg 28.5% · higher = better
David Peterson
30.1%
Kyle Leahy
26.3%
Hard-Hit % Allowedlg 40.0% · lower = better
David Peterson
40.7%
Kyle Leahy
50.2%
Barrel % Allowedlg 8.0% · lower = better
David Peterson
6.6%
Kyle Leahy
11.8%
xwOBA Allowedlg .315 · lower = better
David Peterson
.339
Kyle Leahy
.365
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
3.875.57
lg xERA 4.10
now 5.18
4.59
Kyle Leahy
3.875.57
lg xERA 4.10
now 4.25
5.19
WHIPlower is better
David Peterson
1.351.66
now 1.59
1.43
Kyle Leahy
1.351.66
now 1.56
1.42

Volume · rest of season
Strikeoutshigher is better
David Peterson
4079.60
now 56
70
Kyle Leahy
4079.60
now 46
57
Winshigher is better
David Peterson
.00011.80
now 3
25
Kyle Leahy
.00011.80
now 5
49

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

If you already own them — trade angle
SellDavid Peterson — sell.conf 0.78
SellKyle Leahy — sell.conf 0.90
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