MLB Daily DeltaWeek 28 · October 2, 2026
Portrait of Mark Leiter Jr.
Mark Leiter Jr.
ATH · P
Change to
Portrait of Michael Petersen
Michael Petersen
MIA · 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); Michael Petersen 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
Michael Petersen
98.0
Swinging-Strike %lg 11.0% · higher = better
Mark Leiter Jr.
14.0%
Michael Petersen
15.3%
Strikeout %lg 22.0% · higher = better
Mark Leiter Jr.
26.4%
Michael Petersen
30.1%
Chase %lg 28.5% · higher = better
Mark Leiter Jr.
33.8%
Michael Petersen
33.8%
Hard-Hit % Allowedlg 40.0% · lower = better
Mark Leiter Jr.
31.9%
Michael Petersen
43.2%
Barrel % Allowedlg 8.0% · lower = better
Mark Leiter Jr.
3.3%
Michael Petersen
12.3%
xwOBA Allowedlg .315 · lower = better
Mark Leiter Jr.
.316
Michael Petersen
.287
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.
2.646.28
lg xERA 4.10
now 5.47
3.72
Michael Petersen
2.646.28
lg xERA 4.10
now 3.63
3.45
WHIPlower is better
Mark Leiter Jr.
.9801.60
now 1.46
1.24
Michael Petersen
.9801.60
now 1.12
1.28

Volume · rest of season
Strikeoutshigher is better
Mark Leiter Jr.
4035
now 25
0
Michael Petersen
4035
now 23
0
Winshigher is better
Mark Leiter Jr.
.0001.48
now 0
0–0
Michael Petersen
.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
Sell HighMichael Petersen — sell high. His value is peaking; good time to trade him.conf 0.82
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