MLB Daily DeltaWeek 25 · September 10, 2026
Isaac Mattson
PIT · P
Change to
Trevor Williams
TEX · 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

Isaac Mattson wins 0 (none); Trevor Williams 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
Isaac Mattson
94.2
Trevor Williams
89.9
Swinging-Strike %lg 11.0% · higher = better
Isaac Mattson
10.4%
Trevor Williams
12.2%
Strikeout %lg 22.0% · higher = better
Isaac Mattson
20.5%
Trevor Williams
27.5%
Chase %lg 28.5% · higher = better
Isaac Mattson
27.4%
Trevor Williams
32.2%
Hard-Hit % Allowedlg 40.0% · lower = better
Isaac Mattson
52.1%
Trevor Williams
37.5%
Barrel % Allowedlg 8.0% · lower = better
Isaac Mattson
12.4%
Trevor Williams
7.1%
xwOBA Allowedlg .315 · lower = better
Isaac Mattson
.374
Trevor Williams
.306
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
Isaac Mattson
25.77
lg xERA 4.10
now 4.12
3.70
Trevor Williams
25.77
lg xERA 4.10
now 0.00
3.70
WHIPlower is better
Isaac Mattson
.9002.06
now 1.47
1.24
Trevor Williams
.9002.06
now 0.00
1.24

Volume · rest of season
Strikeoutshigher is better
Isaac Mattson
4020.60
now 15
3
Trevor Williams
4020.60
now 1
3
Winshigher is better
Isaac Mattson
.000.480
now 0
00
Trevor Williams
.000.480
now 0
00

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

If you already own them — trade angle
Hold · wait & seeIsaac Mattson — hold.conf 0.50
Hold · wait & seeTrevor Williams — hold.conf 0.50
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