MLB Daily DeltaWeek 18 · July 23, 2026
Portrait of Martín Pérez
Martín Pérez
ATL · P
Change to
Zac Thornton
NYM · P
Change to
Who's more valuable, rest of season

Zac Thornton.

He projects to help you in more roto categories the rest of the way — strikeouts, ERA, and WHIP. Martín Pérez’s box score looks better right now, but it’s built on luck that won’t hold.

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

Zac Thornton wins 3 categories (K, ERA, WHIP); Martín Pérez wins 1 (W); SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Martín Pérez
90.0
Zac Thornton
92.2
Swinging-Strike %lg 11.0% · higher = better
Martín Pérez
9.3%
Zac Thornton
10.6%
Strikeout %lg 22.0% · higher = better
Martín Pérez
18.6%
Zac Thornton
19.5%
Chase %lg 28.5% · higher = better
Martín Pérez
26.2%
Zac Thornton
31.5%
Hard-Hit % Allowedlg 40.0% · lower = better
Martín Pérez
36.3%
Zac Thornton
37.5%
Barrel % Allowedlg 8.0% · lower = better
Martín Pérez
6.8%
Zac Thornton
12.5%
xwOBA Allowedlg .315 · lower = better
Martín Pérez
.330
Zac Thornton
.317
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
2.135.10
lg xERA 4.10
now 2.79
4.44
Zac Thornton
2.135.10
lg xERA 4.10
now 4.35
4.10
WHIPlower is better
Martín Pérez
.9401.49
now 1.06
1.37
Zac Thornton
.9401.49
now 1.16
1.30

Volume · rest of season
Strikeoutshigher is better
Martín Pérez
4054.80
now 42
38
Zac Thornton
4054.80
now 10
42
Winshigher is better
Martín Pérez
.0005.60
now 3
24
Zac Thornton
.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
Sell HighZac Thornton — sell high. His value is peaking; good time to trade him.conf 0.95
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