MLB Daily DeltaWeek 27 · September 27, 2026
Cionel Pérez
NYM · 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

Cionel Pérez 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
Cionel Pérez
96.7
Shawn Armstrong
93.5
Swinging-Strike %lg 11.0% · higher = better
Cionel Pérez
11.0%
Shawn Armstrong
11.5%
Strikeout %lg 22.0% · higher = better
Cionel Pérez
21.6%
Shawn Armstrong
21.9%
Chase %lg 28.5% · higher = better
Cionel Pérez
30.6%
Shawn Armstrong
24.3%
Hard-Hit % Allowedlg 40.0% · lower = better
Cionel Pérez
49.3%
Shawn Armstrong
34.0%
Barrel % Allowedlg 8.0% · lower = better
Cionel Pérez
11.9%
Shawn Armstrong
6.2%
xwOBA Allowedlg .315 · lower = better
Cionel Pérez
.346
Shawn Armstrong
.306
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
Cionel Pérez
2.716.71
lg xERA 4.10
now 5.82
3.70
Shawn Armstrong
2.716.71
lg xERA 4.10
now 3.60
3.70
WHIPlower is better
Cionel Pérez
1.101.73
now 1.59
1.24
Shawn Armstrong
1.101.73
now 1.33
1.24

Volume · rest of season
Strikeoutshigher is better
Cionel Pérez
4026.60
now 10
0
Shawn Armstrong
4026.60
now 19
0
Winshigher is better
Cionel Pérez
.0002.80
now 2
0–0
Shawn Armstrong
.0002.80
now 1
0–0

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

If you already own them — trade angle
Hold · wait & seeCionel Pérez — hold.conf 0.50
Hold · wait & seeShawn Armstrong — hold.conf 0.50
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