MLB Daily DeltaWeek 27 · September 29, 2026
Portrait of Mark Leiter Jr.
Mark Leiter Jr.
ATH · P
Change to
Portrait of Will Klein
Will Klein
LAD · 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

Mark Leiter Jr. wins 1 (WHIP); Will Klein wins 1 (ERA); 2 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Mark Leiter Jr.
92.2
Will Klein
97.5
Swinging-Strike %lg 11.0% · higher = better
Mark Leiter Jr.
14.0%
Will Klein
10.3%
Strikeout %lg 22.0% · higher = better
Mark Leiter Jr.
26.4%
Will Klein
25.9%
Chase %lg 28.5% · higher = better
Mark Leiter Jr.
33.8%
Will Klein
28.5%
Hard-Hit % Allowedlg 40.0% · lower = better
Mark Leiter Jr.
31.9%
Will Klein
37.9%
Barrel % Allowedlg 8.0% · lower = better
Mark Leiter Jr.
3.3%
Will Klein
2.6%
xwOBA Allowedlg .315 · lower = better
Mark Leiter Jr.
.316
Will Klein
.289
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
Mark Leiter Jr.
26.91
lg xERA 4.10
now 5.47
3.72
Will Klein
26.91
lg xERA 4.10
now 1.88
3.69
WHIPlower is better
Mark Leiter Jr.
.9001.63
now 1.46
1.24
Will Klein
.9001.63
now 1.04
1.25

Volume · rest of season
Strikeoutshigher is better
Mark Leiter Jr.
4035
now 25
0
Will Klein
4035
now 25
0
Winshigher is better
Mark Leiter Jr.
.0001.48
now 0
0–0
Will Klein
.0001.48
now 1
0–0

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

If you already own them — trade angle
Hold · wait & seeMark Leiter Jr. — hold.conf 0.50
Hold · wait & seeWill Klein — hold.conf 0.50
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