MLB Daily DeltaWeek 27 · September 29, 2026
Portrait of Kirby Yates
Kirby Yates
PIT · 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

Kirby Yates 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
Kirby Yates
90.8
Michael Petersen
98.0
Swinging-Strike %lg 11.0% · higher = better
Kirby Yates
14.6%
Michael Petersen
15.3%
Strikeout %lg 22.0% · higher = better
Kirby Yates
27.5%
Michael Petersen
30.1%
Chase %lg 28.5% · higher = better
Kirby Yates
35.3%
Michael Petersen
33.8%
Hard-Hit % Allowedlg 40.0% · lower = better
Kirby Yates
47.2%
Michael Petersen
43.2%
Barrel % Allowedlg 8.0% · lower = better
Kirby Yates
5.6%
Michael Petersen
12.3%
xwOBA Allowedlg .315 · lower = better
Kirby Yates
.285
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
Kirby Yates
3.104.67
lg xERA 4.10
now 4.32
3.70
Michael Petersen
3.104.67
lg xERA 4.10
now 3.63
3.45
WHIPlower is better
Kirby Yates
1.051.35
now 1.20
1.24
Michael Petersen
1.051.35
now 1.12
1.28

Volume · rest of season
Strikeoutshigher is better
Kirby Yates
4032.20
now 10
0
Michael Petersen
4032.20
now 23
0
Winshigher is better
Kirby Yates
.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 & seeKirby Yates — 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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