MLB Daily DeltaWeek 27 · September 28, 2026
Portrait of George Kirby
George Kirby
SEA · P
Change to
Portrait of Steven Matz
Steven Matz
TB · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 1–1, 2 even. Take whoever fills a bigger need.

Head-to-head
K
◀
ERA
WHIP
▶
W
SV n/a

George Kirby wins 1 (ERA); Steven Matz wins 1 (WHIP); 2 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
George Kirby
96.7
Steven Matz
93.6
Swinging-Strike %lg 11.0% · higher = better
George Kirby
11.7%
Steven Matz
10.0%
Strikeout %lg 22.0% · higher = better
George Kirby
20.0%
Steven Matz
17.8%
Chase %lg 28.5% · higher = better
George Kirby
34.3%
Steven Matz
29.1%
Hard-Hit % Allowedlg 40.0% · lower = better
George Kirby
40.1%
Steven Matz
35.4%
Barrel % Allowedlg 8.0% · lower = better
George Kirby
6.6%
Steven Matz
10.6%
xwOBA Allowedlg .315 · lower = better
George Kirby
.315
Steven Matz
.342
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
George Kirby
3.395.10
lg xERA 4.10
now 3.77
4.17
Steven Matz
3.395.10
lg xERA 4.10
now 4.67
4.72
WHIPlower is better
George Kirby
1.151.46
now 1.22
1.39
Steven Matz
1.151.46
now 1.24
1.31

Volume · rest of season
Strikeoutshigher is better
George Kirby
4082.60
now 59
0
Steven Matz
4082.60
now 35
0
Winshigher is better
George Kirby
.0007
now 5
0–0
Steven Matz
.0007
now 4
0–0

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

If you already own them — trade angle
Hold · steadyGeorge Kirby — hold.conf 0.60
SellSteven Matz — sell.conf 0.83
Tweet