MLB Daily DeltaWeek 27 · September 27, 2026
Portrait of Aaron Ashby
Aaron Ashby
MIL · P
Change to
Portrait of Michael Petersen
Michael Petersen
MIA · 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

Aaron Ashby wins 1 (ERA); Michael Petersen 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
Aaron Ashby
97.3
Michael Petersen
98.0
Swinging-Strike %lg 11.0% · higher = better
Aaron Ashby
12.8%
Michael Petersen
15.4%
Strikeout %lg 22.0% · higher = better
Aaron Ashby
30.2%
Michael Petersen
30.7%
Chase %lg 28.5% · higher = better
Aaron Ashby
29.4%
Michael Petersen
33.9%
Hard-Hit % Allowedlg 40.0% · lower = better
Aaron Ashby
40.9%
Michael Petersen
42.4%
Barrel % Allowedlg 8.0% · lower = better
Aaron Ashby
5.0%
Michael Petersen
11.9%
xwOBA Allowedlg .315 · lower = better
Aaron Ashby
.271
Michael Petersen
.284
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
Aaron Ashby
24.28
lg xERA 4.10
now 2.00
3.06
Michael Petersen
24.28
lg xERA 4.10
now 3.63
3.37
WHIPlower is better
Aaron Ashby
1.041.39
now 1.28
1.31
Michael Petersen
1.041.39
now 1.12
1.27

Volume · rest of season
Strikeoutshigher is better
Aaron Ashby
4071.40
now 51
0
Michael Petersen
4071.40
now 23
0
Winshigher is better
Aaron Ashby
.00012.60
now 9
0–0
Michael Petersen
.00012.60
now 1
0–0

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

If you already own them — trade angle
BuyAaron Ashby — buy.conf 0.91
BuyMichael Petersen — buy.conf 0.82
Tweet