MLB Daily DeltaWeek 13 · June 20, 2026
Portrait of Janson Junk
Janson Junk
MIA · P
Change to
Portrait of Martín Pérez
Martín Pérez
ATL · P
Change to
Who's more valuable, rest of season

Janson Junk.

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

Janson Junk 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
Janson Junk
94.3
Martín Pérez
90.2
Swinging-Strike %lg 11.0% · higher = better
Janson Junk
8.9%
Martín Pérez
9.8%
Strikeout %lg 22.0% · higher = better
Janson Junk
16.9%
Martín Pérez
20.8%
Chase %lg 28.5% · higher = better
Janson Junk
28.5%
Martín Pérez
27.1%
Hard-Hit % Allowedlg 40.0% · lower = better
Janson Junk
41.6%
Martín Pérez
38.0%
Barrel % Allowedlg 8.0% · lower = better
Janson Junk
6.6%
Martín Pérez
7.0%
xwOBA Allowedlg .315 · lower = better
Janson Junk
.310
Martín Pérez
.314
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
Janson Junk
25.60
lg xERA 4.10
now 4.80
3.91
Martín Pérez
25.60
lg xERA 4.10
now 2.79
4.02
WHIPlower is better
Janson Junk
.9601.42
now 1.30
1.31
Martín Pérez
.9601.42
now 1.06
1.32

Volume · rest of season
Strikeoutshigher is better
Janson Junk
4070
now 43
62
Martín Pérez
4070
now 42
58
Winshigher is better
Janson Junk
1.807.20
now 3
36
Martín Pérez
1.807.20
now 3
36

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

If you already own them — trade angle
Hold · leans buyJanson Junk — hold.conf 0.60
Sell HighMartín Pérez — sell high. His value is peaking; good time to trade him.conf 0.95
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