MLB Daily DeltaWeek 25 · September 10, 2026
Portrait of Martín Pérez
Martín Pérez
ATL · P
Change to
Portrait of Michael McGreevy
Michael McGreevy
STL · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 11, 2 even. Take whoever fills a bigger need.

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

Martín Pérez wins 1 (ERA); Michael McGreevy wins 1 (WHIP); 2 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Martín Pérez
89.9
Michael McGreevy
91.8
Swinging-Strike %lg 11.0% · higher = better
Martín Pérez
9.4%
Michael McGreevy
8.8%
Strikeout %lg 22.0% · higher = better
Martín Pérez
18.0%
Michael McGreevy
16.7%
Chase %lg 28.5% · higher = better
Martín Pérez
26.9%
Michael McGreevy
29.0%
Hard-Hit % Allowedlg 40.0% · lower = better
Martín Pérez
38.1%
Michael McGreevy
41.8%
Barrel % Allowedlg 8.0% · lower = better
Martín Pérez
5.4%
Michael McGreevy
9.7%
xwOBA Allowedlg .315 · lower = better
Martín Pérez
.334
Michael McGreevy
.352
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
Martín Pérez
25.77
lg xERA 4.10
now 2.79
4.52
Michael McGreevy
25.77
lg xERA 4.10
now 2.98
4.92
WHIPlower is better
Martín Pérez
.9301.52
now 1.06
1.39
Michael McGreevy
.9301.52
now 1.10
1.32

Volume · rest of season
Strikeoutshigher is better
Martín Pérez
4058
now 42
9
Michael McGreevy
4058
now 44
9
Winshigher is better
Martín Pérez
.0004.20
now 3
01
Michael McGreevy
.0004.20
now 3
01

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

If you already own them — trade angle
Sell HighMartín Pérez — sell high. His value is peaking; good time to trade him.conf 0.95
SellMichael McGreevy — sell.conf 0.90
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