MLB Daily DeltaWeek 27 · September 29, 2026
Chris Roycroft
ATH · 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

Chris Roycroft wins 1 (WHIP); Michael Petersen 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
Chris Roycroft
95.1
Michael Petersen
98.0
Swinging-Strike %lg 11.0% · higher = better
Chris Roycroft
8.1%
Michael Petersen
15.3%
Strikeout %lg 22.0% · higher = better
Chris Roycroft
15.3%
Michael Petersen
30.1%
Chase %lg 28.5% · higher = better
Chris Roycroft
25.0%
Michael Petersen
33.8%
Hard-Hit % Allowedlg 40.0% · lower = better
Chris Roycroft
43.4%
Michael Petersen
43.2%
Barrel % Allowedlg 8.0% · lower = better
Chris Roycroft
9.6%
Michael Petersen
12.3%
xwOBA Allowedlg .315 · lower = better
Chris Roycroft
.375
Michael Petersen
.287
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
Chris Roycroft
28.25
lg xERA 4.10
now 12.27
3.70
Michael Petersen
28.25
lg xERA 4.10
now 3.63
3.45
WHIPlower is better
Chris Roycroft
.9002.55
now 3.55
1.24
Michael Petersen
.9002.55
now 1.12
1.28

Volume · rest of season
Strikeoutshigher is better
Chris Roycroft
4032.20
now 3
0
Michael Petersen
4032.20
now 23
0
Winshigher is better
Chris Roycroft
.0001.48
now 0
0–0
Michael Petersen
.0001.48
now 1
0–0

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

If you already own them — trade angle
Hold · wait & seeChris Roycroft — hold.conf 0.50
Sell HighMichael Petersen — sell high. His value is peaking; good time to trade him.conf 0.82
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