MLB Daily DeltaWeek 13 · June 20, 2026
Portrait of Stephen Kolek
Stephen Kolek
KC · P
Change to
Portrait of Zebby Matthews
Zebby Matthews
MIN · P
Change to
Who's more valuable, rest of season

Stephen Kolek.

He projects to help you in more roto categories the rest of the way — ERA and wins.

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

Stephen Kolek wins 2 categories (ERA, W); Zebby Matthews wins 1 (K); 1 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
Zebby Matthews
95.1
Swinging-Strike %lg 11.0% · higher = better
Stephen Kolek
10.2%
Zebby Matthews
10.8%
Strikeout %lg 22.0% · higher = better
Stephen Kolek
17.2%
Zebby Matthews
19.1%
Chase %lg 28.5% · higher = better
Stephen Kolek
26.6%
Zebby Matthews
28.7%
Hard-Hit % Allowedlg 40.0% · lower = better
Stephen Kolek
38.6%
Zebby Matthews
39.1%
Barrel % Allowedlg 8.0% · lower = better
Stephen Kolek
6.5%
Zebby Matthews
11.3%
xwOBA Allowedlg .315 · lower = better
Stephen Kolek
.291
Zebby Matthews
.305
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
3.025.09
lg xERA 4.10
now 3.48
4.03
Zebby Matthews
3.025.09
lg xERA 4.10
now 4.63
4.09
WHIPlower is better
Stephen Kolek
.9001.44
now 0.94
1.30
Zebby Matthews
.9001.44
now 1.03
1.30

Volume · rest of season
Strikeoutshigher is better
Stephen Kolek
40112.80
now 19
47
Zebby Matthews
40112.80
now 24
86
Winshigher is better
Stephen Kolek
.00013.60
now 3
510
Zebby Matthews
.00013.60
now 1
24

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

If you already own them — trade angle
Sell HighStephen Kolek — sell high. His value is peaking; good time to trade him.conf 0.84
Hold · wait & seeZebby Matthews — hold.conf 0.50
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