MLB Daily DeltaWeek 25 · September 10, 2026
Portrait of Ryan Weathers
Ryan Weathers
NYY · P
Change to
Portrait of Stephen Kolek
Stephen Kolek
KC · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 22. Take whoever fills a bigger need.

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

Ryan Weathers wins 2 (K, WHIP); Stephen Kolek wins 2 (ERA, W); SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Ryan Weathers
95.8
Stephen Kolek
94.2
Swinging-Strike %lg 11.0% · higher = better
Ryan Weathers
12.1%
Stephen Kolek
9.6%
Strikeout %lg 22.0% · higher = better
Ryan Weathers
25.2%
Stephen Kolek
15.2%
Chase %lg 28.5% · higher = better
Ryan Weathers
28.9%
Stephen Kolek
26.7%
Hard-Hit % Allowedlg 40.0% · lower = better
Ryan Weathers
40.6%
Stephen Kolek
36.9%
Barrel % Allowedlg 8.0% · lower = better
Ryan Weathers
8.6%
Stephen Kolek
6.8%
xwOBA Allowedlg .315 · lower = better
Ryan Weathers
.319
Stephen Kolek
.303
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
Ryan Weathers
3.184.52
lg xERA 4.10
now 3.52
4.22
Stephen Kolek
3.184.52
lg xERA 4.10
now 3.48
3.84
WHIPlower is better
Ryan Weathers
.9001.47
now 1.14
1.25
Stephen Kolek
.9001.47
now 0.94
1.32

Volume · rest of season
Strikeoutshigher is better
Ryan Weathers
40101.80
now 75
15
Stephen Kolek
40101.80
now 19
8
Winshigher is better
Ryan Weathers
.0004.20
now 2
01
Stephen Kolek
.0004.20
now 3
12

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

If you already own them — trade angle
Hold · leans sellRyan Weathers — hold.conf 0.60
Hold · leans buyStephen Kolek — hold.conf 0.60
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