MLB Daily DeltaWeek 27 · September 28, 2026
Portrait of Aroldis Chapman
Aroldis Chapman
BOS · P
Change to
Portrait of Ian Seymour
Ian Seymour
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

Aroldis Chapman wins 1 (ERA); Ian Seymour 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
Aroldis Chapman
96.9
Ian Seymour
91.4
Swinging-Strike %lg 11.0% · higher = better
Aroldis Chapman
15.8%
Ian Seymour
15.2%
Strikeout %lg 22.0% · higher = better
Aroldis Chapman
33.3%
Ian Seymour
28.7%
Chase %lg 28.5% · higher = better
Aroldis Chapman
33.1%
Ian Seymour
35.3%
Hard-Hit % Allowedlg 40.0% · lower = better
Aroldis Chapman
38.1%
Ian Seymour
37.0%
Barrel % Allowedlg 8.0% · lower = better
Aroldis Chapman
6.8%
Ian Seymour
10.0%
xwOBA Allowedlg .315 · lower = better
Aroldis Chapman
.252
Ian Seymour
.292
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
Aroldis Chapman
26.33
lg xERA 4.10
now 0.48
2.64
Ian Seymour
26.33
lg xERA 4.10
now 4.66
3.57
WHIPlower is better
Aroldis Chapman
.9001.45
now 0.86
1.25
Ian Seymour
.9001.45
now 1.28
1.13

Volume · rest of season
Strikeoutshigher is better
Aroldis Chapman
4044.80
now 25
0
Ian Seymour
4044.80
now 32
0
Winshigher is better
Aroldis Chapman
.0004.20
now 0
0–0
Ian Seymour
.0004.20
now 3
0–0

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

If you already own them — trade angle
BuyAroldis Chapman — buy.conf 0.92
BuyIan Seymour — buy.conf 0.76
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