MLB Daily DeltaWeek 27 · September 30, 2026
Cesar Perdomo
SF · P
Change to
Kenley Jansen
DET · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 0–0, 4 even. Take whoever fills a bigger need.

Head-to-head
K
ERA
WHIP
W
SV n/a

Cesar Perdomo wins 0 (none); Kenley Jansen wins 0 (none); 4 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
Kenley Jansen
93.9
Swinging-Strike %lg 11.0% · higher = better
Cesar Perdomo
9.9%
Kenley Jansen
13.0%
Strikeout %lg 22.0% · higher = better
Cesar Perdomo
13.5%
Kenley Jansen
28.3%
Chase %lg 28.5% · higher = better
Cesar Perdomo
27.9%
Kenley Jansen
30.1%
Hard-Hit % Allowedlg 40.0% · lower = better
Cesar Perdomo
42.2%
Kenley Jansen
38.1%
Barrel % Allowedlg 8.0% · lower = better
Cesar Perdomo
7.2%
Kenley Jansen
9.5%
xwOBA Allowedlg .315 · lower = better
Cesar Perdomo
.324
Kenley Jansen
.293
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
25.82
lg xERA 4.10
now 2.25
3.70
Kenley Jansen
25.82
lg xERA 4.10
now 4.80
3.70
WHIPlower is better
Cesar Perdomo
.9001.34
now 1.00
1.24
Kenley Jansen
.9001.34
now 1.20
1.24

Volume · rest of season
Strikeoutshigher is better
Cesar Perdomo
4026.60
now 4
0
Kenley Jansen
4026.60
now 19
0
Winshigher is better
Cesar Perdomo
.0001.48
now 0
0–0
Kenley Jansen
.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 HighKenley Jansen — sell high. His value is peaking; good time to trade him.conf 0.71
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