MLB Daily DeltaWeek 19 · August 1, 2026
Portrait of Spencer Arrighetti
Spencer Arrighetti
HOU · P
Change to
Portrait of Trevor McDonald
Trevor McDonald
SF · P
Change to
Who's more valuable, rest of season

Trevor McDonald.

He projects to help you in more roto categories the rest of the way — ERA and WHIP. Spencer Arrighetti’s box score looks better right now, but it’s built on luck that won’t hold.

Head-to-head
K
ERA
WHIP
W
SV n/a

Trevor McDonald wins 2 categories (ERA, WHIP); Spencer Arrighetti wins 1 (W); 1 even; SV n/a.

04

Under the hood

Underlying skill — each value vs league avg
Fastball Velolg 94.0 · higher = better
Spencer Arrighetti
92.4
Trevor McDonald
94.0
Swinging-Strike %lg 11.0% · higher = better
Spencer Arrighetti
10.7%
Trevor McDonald
9.5%
Strikeout %lg 22.0% · higher = better
Spencer Arrighetti
22.5%
Trevor McDonald
18.4%
Chase %lg 28.5% · higher = better
Spencer Arrighetti
26.1%
Trevor McDonald
29.3%
Hard-Hit % Allowedlg 40.0% · lower = better
Spencer Arrighetti
30.6%
Trevor McDonald
37.8%
Barrel % Allowedlg 8.0% · lower = better
Spencer Arrighetti
7.7%
Trevor McDonald
4.1%
xwOBA Allowedlg .315 · lower = better
Spencer Arrighetti
.345
Trevor McDonald
.312
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
Spencer Arrighetti
26.11
lg xERA 4.10
now 1.34
4.75
Trevor McDonald
26.11
lg xERA 4.10
now 4.34
4.08
WHIPlower is better
Spencer Arrighetti
.9301.57
now 1.13
1.43
Trevor McDonald
.9301.57
now 1.07
1.35

Volume · rest of season
Strikeoutshigher is better
Spencer Arrighetti
4049.40
now 43
41
Trevor McDonald
4049.40
now 27
41
Winshigher is better
Spencer Arrighetti
.00011.80
now 7
49
Trevor McDonald
.00011.80
now 2
24

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

If you already own them — trade angle
Sell HighSpencer Arrighetti — sell high. His value is peaking; good time to trade him.conf 0.85
Hold · steadyTrevor McDonald — hold.conf 0.60
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