MLB Daily DeltaWeek 27 · September 28, 2026
Garrett Whitlock
BOS · P
Change to
Portrait of Ryan Zeferjahn
Ryan Zeferjahn
CHC · 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

Garrett Whitlock wins 1 (WHIP); Ryan Zeferjahn wins 1 (ERA); 2 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Garrett Whitlock
94.9
Ryan Zeferjahn
97.5
Swinging-Strike %lg 11.0% · higher = better
Garrett Whitlock
18.1%
Ryan Zeferjahn
13.5%
Strikeout %lg 22.0% · higher = better
Garrett Whitlock
29.8%
Ryan Zeferjahn
31.0%
Chase %lg 28.5% · higher = better
Garrett Whitlock
42.1%
Ryan Zeferjahn
26.8%
Hard-Hit % Allowedlg 40.0% · lower = better
Garrett Whitlock
33.8%
Ryan Zeferjahn
35.6%
Barrel % Allowedlg 8.0% · lower = better
Garrett Whitlock
3.8%
Ryan Zeferjahn
5.6%
xwOBA Allowedlg .315 · lower = better
Garrett Whitlock
.251
Ryan Zeferjahn
.273
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
Garrett Whitlock
26.82
lg xERA 4.10
now 3.05
3.69
Ryan Zeferjahn
26.82
lg xERA 4.10
now 5.74
3.10
WHIPlower is better
Garrett Whitlock
11.50
now 1.11
1.24
Ryan Zeferjahn
11.50
now 1.39
1.33

Volume · rest of season
Strikeoutshigher is better
Garrett Whitlock
4044.80
now 26
0
Ryan Zeferjahn
4044.80
now 32
0
Winshigher is better
Garrett Whitlock
.0004.20
now 3
0–0
Ryan Zeferjahn
.0004.20
now 2
0–0

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

If you already own them — trade angle
Hold · wait & seeGarrett Whitlock — hold.conf 0.50
BuyRyan Zeferjahn — buy.conf 0.90
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