MLB Daily DeltaWeek 27 · September 30, 2026
Cesar Perdomo
SF · P
Change to
Portrait of Shawn Armstrong
Shawn Armstrong
CLE · 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); Shawn Armstrong 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
Shawn Armstrong
93.5
Swinging-Strike %lg 11.0% · higher = better
Cesar Perdomo
9.9%
Shawn Armstrong
11.6%
Strikeout %lg 22.0% · higher = better
Cesar Perdomo
13.5%
Shawn Armstrong
22.1%
Chase %lg 28.5% · higher = better
Cesar Perdomo
27.9%
Shawn Armstrong
24.2%
Hard-Hit % Allowedlg 40.0% · lower = better
Cesar Perdomo
42.2%
Shawn Armstrong
35.4%
Barrel % Allowedlg 8.0% · lower = better
Cesar Perdomo
7.2%
Shawn Armstrong
7.1%
xwOBA Allowedlg .315 · lower = better
Cesar Perdomo
.324
Shawn Armstrong
.315
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
Shawn Armstrong
24.28
lg xERA 4.10
now 3.60
3.70
WHIPlower is better
Cesar Perdomo
.9001.46
now 1.00
1.24
Shawn Armstrong
.9001.46
now 1.33
1.24

Volume · rest of season
Strikeoutshigher is better
Cesar Perdomo
4026.60
now 4
0
Shawn Armstrong
4026.60
now 19
0
Winshigher is better
Cesar Perdomo
.0001.48
now 0
0–0
Shawn Armstrong
.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
Hold · wait & seeShawn Armstrong — hold.conf 0.50
Tweet