MLB Daily DeltaWeek 18 · July 27, 2026
Portrait of Jack Leiter
Jack Leiter
TEX · P
Change to
Portrait of Mitch Keller
Mitch Keller
PIT · 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

Jack Leiter wins 2 (K, ERA); Mitch Keller wins 2 (WHIP, W); SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Jack Leiter
96.7
Mitch Keller
93.4
Swinging-Strike %lg 11.0% · higher = better
Jack Leiter
12.2%
Mitch Keller
10.1%
Strikeout %lg 22.0% · higher = better
Jack Leiter
23.4%
Mitch Keller
17.9%
Chase %lg 28.5% · higher = better
Jack Leiter
30.4%
Mitch Keller
30.1%
Hard-Hit % Allowedlg 40.0% · lower = better
Jack Leiter
39.9%
Mitch Keller
42.0%
Barrel % Allowedlg 8.0% · lower = better
Jack Leiter
10.3%
Mitch Keller
7.1%
xwOBA Allowedlg .315 · lower = better
Jack Leiter
.336
Mitch Keller
.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
Jack Leiter
4.125.07
lg xERA 4.10
now 4.34
4.57
Mitch Keller
4.125.07
lg xERA 4.10
now 4.35
4.85
WHIPlower is better
Jack Leiter
1.091.45
now 1.33
1.37
Mitch Keller
1.091.45
now 1.17
1.36

Volume · rest of season
Strikeoutshigher is better
Jack Leiter
4087.60
now 74
55
Mitch Keller
4087.60
now 51
40
Winshigher is better
Jack Leiter
.0006.60
now 3
13
Mitch Keller
.0006.60
now 5
25

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

If you already own them — trade angle
SellJack Leiter — sell.conf 0.77
SellMitch Keller — sell.conf 0.90
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