MLB Daily DeltaWeek 27 · September 27, 2026
Portrait of Stephen Kolek
Stephen Kolek
KC · P
Change to
Portrait of Tanner Bibee
Tanner Bibee
CLE · 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

Stephen Kolek wins 1 (ERA); Tanner Bibee 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
Stephen Kolek
94.2
Tanner Bibee
94.0
Swinging-Strike %lg 11.0% · higher = better
Stephen Kolek
9.6%
Tanner Bibee
11.0%
Strikeout %lg 22.0% · higher = better
Stephen Kolek
15.2%
Tanner Bibee
18.8%
Chase %lg 28.5% · higher = better
Stephen Kolek
26.7%
Tanner Bibee
27.5%
Hard-Hit % Allowedlg 40.0% · lower = better
Stephen Kolek
36.9%
Tanner Bibee
39.4%
Barrel % Allowedlg 8.0% · lower = better
Stephen Kolek
6.8%
Tanner Bibee
8.1%
xwOBA Allowedlg .315 · lower = better
Stephen Kolek
.303
Tanner Bibee
.318
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
Stephen Kolek
3.045.01
lg xERA 4.10
now 3.48
3.86
Tanner Bibee
3.045.01
lg xERA 4.10
now 4.57
4.22
WHIPlower is better
Stephen Kolek
.9001.47
now 0.94
1.32
Tanner Bibee
.9001.47
now 1.30
1.27

Volume · rest of season
Strikeoutshigher is better
Stephen Kolek
4084
now 19
0
Tanner Bibee
4084
now 60
0
Winshigher is better
Stephen Kolek
.0004.20
now 3
0–0
Tanner Bibee
.0004.20
now 0
0–0

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

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