MLB Daily DeltaWeek 17 · July 21, 2026
Portrait of Jack Perkins
Jack Perkins
ATH · P
Change to
Portrait of Kevin Kelly
Kevin Kelly
TB · P
Change to
Who's more valuable, rest of season

Too close to call.

They split your categories 22, 1 even. Take whoever fills a bigger need.

Head-to-head
K
ERA
WHIP
W
SV

Jack Perkins wins 2 (K, SV); Kevin Kelly wins 2 (ERA, WHIP); 1 even.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Jack Perkins
96.0
Kevin Kelly
93.0
Swinging-Strike %lg 11.0% · higher = better
Jack Perkins
13.2%
Kevin Kelly
8.6%
Strikeout %lg 22.0% · higher = better
Jack Perkins
27.3%
Kevin Kelly
19.4%
Chase %lg 28.5% · higher = better
Jack Perkins
33.7%
Kevin Kelly
32.2%
Hard-Hit % Allowedlg 40.0% · lower = better
Jack Perkins
39.4%
Kevin Kelly
46.2%
Barrel % Allowedlg 8.0% · lower = better
Jack Perkins
8.0%
Kevin Kelly
6.9%
xwOBA Allowedlg .315 · lower = better
Jack Perkins
.318
Kevin Kelly
.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
Jack Perkins
26.58
lg xERA 4.10
now 5.46
4.06
Kevin Kelly
26.58
lg xERA 4.10
now 2.67
3.74
WHIPlower is better
Jack Perkins
.9001.47
now 1.21
1.28
Kevin Kelly
.9001.47
now 0.81
1.24

Volume · rest of season
Strikeoutshigher is better
Jack Perkins
4039.80
now 33
28
Kevin Kelly
4039.80
now 19
16
Winshigher is better
Jack Perkins
.0005.20
now 2
12
Kevin Kelly
.0005.20
now 3
14
Saveshigher is better
Jack Perkins
.0004.40
now 3
23
Kevin Kelly
.0004.40
now 2
13
If you already own them — trade angle
Buy LowJack Perkins — buy low. The dip is a window to acquire.conf 0.90
Sell HighKevin Kelly — sell high. His value is peaking; good time to trade him.conf 0.95
Tweet