MLB Daily DeltaWeek 27 · September 27, 2026
Cionel Pérez
NYM · P
Change to
Portrait of Kirby Yates
Kirby Yates
PIT · 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); Kirby Yates 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
Kirby Yates
90.8
Swinging-Strike %lg 11.0% · higher = better
Cionel Pérez
11.0%
Kirby Yates
14.9%
Strikeout %lg 22.0% · higher = better
Cionel Pérez
21.6%
Kirby Yates
27.9%
Chase %lg 28.5% · higher = better
Cionel Pérez
30.6%
Kirby Yates
35.2%
Hard-Hit % Allowedlg 40.0% · lower = better
Cionel Pérez
49.3%
Kirby Yates
46.6%
Barrel % Allowedlg 8.0% · lower = better
Cionel Pérez
11.9%
Kirby Yates
5.8%
xwOBA Allowedlg .315 · lower = better
Cionel Pérez
.346
Kirby Yates
.286
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
2.856.67
lg xERA 4.10
now 5.82
3.70
Kirby Yates
2.856.67
lg xERA 4.10
now 4.32
3.70
WHIPlower is better
Cionel Pérez
1.041.75
now 1.59
1.24
Kirby Yates
1.041.75
now 1.20
1.24

Volume · rest of season
Strikeoutshigher is better
Cionel Pérez
4015.60
now 10
0
Kirby Yates
4015.60
now 10
0
Winshigher is better
Cionel Pérez
.0002.80
now 2
0–0
Kirby Yates
.0002.80
now 0
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 & seeKirby Yates — hold.conf 0.50
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