MLB Daily DeltaWeek 27 · September 30, 2026
Cesar Perdomo
SF · 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

Cesar Perdomo 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
Cesar Perdomo
93.0
Michael Petersen
98.0
Swinging-Strike %lg 11.0% · higher = better
Cesar Perdomo
9.9%
Michael Petersen
15.3%
Strikeout %lg 22.0% · higher = better
Cesar Perdomo
13.5%
Michael Petersen
30.1%
Chase %lg 28.5% · higher = better
Cesar Perdomo
27.9%
Michael Petersen
33.8%
Hard-Hit % Allowedlg 40.0% · lower = better
Cesar Perdomo
42.2%
Michael Petersen
43.2%
Barrel % Allowedlg 8.0% · lower = better
Cesar Perdomo
7.2%
Michael Petersen
12.3%
xwOBA Allowedlg .315 · lower = better
Cesar Perdomo
.324
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
Cesar Perdomo
24.28
lg xERA 4.10
now 2.25
3.70
Michael Petersen
24.28
lg xERA 4.10
now 3.63
3.45
WHIPlower is better
Cesar Perdomo
.9001.39
now 1.00
1.24
Michael Petersen
.9001.39
now 1.12
1.28

Volume · rest of season
Strikeoutshigher is better
Cesar Perdomo
4032.20
now 4
0
Michael Petersen
4032.20
now 23
0
Winshigher is better
Cesar Perdomo
.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 & seeCesar Perdomo — 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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