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

Robert Stock.

He projects to help you in more roto categories the rest of the way — ERA and WHIP.

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

Robert Stock wins 2 categories (ERA, WHIP); Martín Pérez wins 1 (W); 1 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
Robert Stock
95.7
Swinging-Strike %lg 11.0% · higher = better
Martín Pérez
9.4%
Robert Stock
12.1%
Strikeout %lg 22.0% · higher = better
Martín Pérez
18.0%
Robert Stock
19.7%
Chase %lg 28.5% · higher = better
Martín Pérez
26.9%
Robert Stock
29.0%
Hard-Hit % Allowedlg 40.0% · lower = better
Martín Pérez
38.1%
Robert Stock
31.4%
Barrel % Allowedlg 8.0% · lower = better
Martín Pérez
5.4%
Robert Stock
7.0%
xwOBA Allowedlg .315 · lower = better
Martín Pérez
.334
Robert Stock
.327
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
25.61
lg xERA 4.10
now 2.79
4.52
Robert Stock
25.61
lg xERA 4.10
now 1.80
4.10
WHIPlower is better
Martín Pérez
.9001.71
now 1.06
1.39
Robert Stock
.9001.71
now 0.60
1.30

Volume · rest of season
Strikeoutshigher is better
Martín Pérez
4057.20
now 42
9
Robert Stock
4057.20
now 4
9
Winshigher is better
Martín Pérez
.0004.20
now 3
01
Robert Stock
.0004.20
now 0
00

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
Hold · wait & seeRobert Stock — hold.conf 0.55
Tweet