MLB Daily DeltaWeek 17 · July 20, 2026
Portrait of Mason Montgomery
Mason Montgomery
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 11, 3 even. Take whoever fills a bigger need.

Head-to-head
K
ERA
WHIP
W
SV

Mason Montgomery wins 1 (K); Michael Petersen wins 1 (SV); 3 even.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Mason Montgomery
98.2
Michael Petersen
97.7
Swinging-Strike %lg 11.0% · higher = better
Mason Montgomery
15.6%
Michael Petersen
14.3%
Strikeout %lg 22.0% · higher = better
Mason Montgomery
34.6%
Michael Petersen
29.8%
Chase %lg 28.5% · higher = better
Mason Montgomery
30.7%
Michael Petersen
31.4%
Hard-Hit % Allowedlg 40.0% · lower = better
Mason Montgomery
39.8%
Michael Petersen
44.4%
Barrel % Allowedlg 8.0% · lower = better
Mason Montgomery
9.1%
Michael Petersen
12.1%
xwOBA Allowedlg .315 · lower = better
Mason Montgomery
.278
Michael Petersen
.285
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
Mason Montgomery
3.414.13
lg xERA 4.10
now 3.91
3.69
Michael Petersen
3.414.13
lg xERA 4.10
now 3.63
3.69
WHIPlower is better
Mason Montgomery
1.051.33
now 1.26
1.24
Michael Petersen
1.051.33
now 1.12
1.24

Volume · rest of season
Strikeoutshigher is better
Mason Montgomery
4035.60
now 30
25
Michael Petersen
4035.60
now 23
18
Winshigher is better
Mason Montgomery
.0001.48
now 1
01
Michael Petersen
.0001.48
now 1
11
Saveshigher is better
Mason Montgomery
.0003.40
now 0
0
Michael Petersen
.0003.40
now 1
02
If you already own them — trade angle
Buy LowMason Montgomery — buy low. The dip is a window to acquire.conf 0.85
Sell HighMichael Petersen — sell high. His value is peaking; good time to trade him.conf 0.69
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