MLB Daily DeltaWeek 20 · August 9, 2026
Portrait of Mason Black
Mason Black
KC · P
Change to
Seth Johnson
ATH · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 00, 4 even. Take whoever fills a bigger need.

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

Mason Black wins 0 (none); Seth Johnson wins 0 (none); 4 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Mason Black
94.0
Seth Johnson
97.9
Swinging-Strike %lg 11.0% · higher = better
Mason Black
8.3%
Seth Johnson
12.6%
Strikeout %lg 22.0% · higher = better
Mason Black
16.5%
Seth Johnson
27.0%
Chase %lg 28.5% · higher = better
Mason Black
23.0%
Seth Johnson
23.2%
Hard-Hit % Allowedlg 40.0% · lower = better
Mason Black
48.6%
Seth Johnson
40.0%
Barrel % Allowedlg 8.0% · lower = better
Mason Black
11.4%
Seth Johnson
12.0%
xwOBA Allowedlg .315 · lower = better
Mason Black
.391
Seth Johnson
.322
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
Mason Black
27.27
lg xERA 4.10
now 2.08
3.70
Seth Johnson
27.27
lg xERA 4.10
now 5.79
3.70
WHIPlower is better
Mason Black
1.051.90
now 1.50
1.24
Seth Johnson
1.051.90
now 1.71
1.24

Volume · rest of season
Strikeoutshigher is better
Mason Black
4021.60
now 9
16
Seth Johnson
4021.60
now 6
16
Winshigher is better
Mason Black
.000.480
now 0
00
Seth Johnson
.000.480
now 0
00

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

If you already own them — trade angle
Sell HighMason Black — sell high. His value is peaking; good time to trade him.conf 0.95
Hold · wait & seeSeth Johnson — hold.conf 0.55
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