MLB Daily DeltaWeek 17 · July 18, 2026
Portrait of Martín Pérez
Martín Pérez
ATL · P
Change to
Robert Gasser
MIL · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 22. Take whoever fills a bigger need.

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

Martín Pérez wins 2 (K, W); Robert Gasser wins 2 (ERA, WHIP); SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Martín Pérez
90.0
Robert Gasser
92.4
Swinging-Strike %lg 11.0% · higher = better
Martín Pérez
9.3%
Robert Gasser
11.9%
Strikeout %lg 22.0% · higher = better
Martín Pérez
18.6%
Robert Gasser
21.4%
Chase %lg 28.5% · higher = better
Martín Pérez
26.2%
Robert Gasser
28.8%
Hard-Hit % Allowedlg 40.0% · lower = better
Martín Pérez
36.3%
Robert Gasser
30.2%
Barrel % Allowedlg 8.0% · lower = better
Martín Pérez
6.8%
Robert Gasser
7.2%
xwOBA Allowedlg .315 · lower = better
Martín Pérez
.330
Robert Gasser
.304
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
2.015.51
lg xERA 4.10
now 2.79
4.41
Robert Gasser
2.015.51
lg xERA 4.10
now 4.73
3.82
WHIPlower is better
Martín Pérez
.9101.58
now 1.06
1.37
Robert Gasser
.9101.58
now 1.43
1.29

Volume · rest of season
Strikeoutshigher is better
Martín Pérez
4054
now 42
41
Robert Gasser
4054
now 12
34
Winshigher is better
Martín Pérez
.0005.60
now 3
24
Robert Gasser
.0005.60
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 · leans buyRobert Gasser — hold.conf 0.60
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