MLB Daily DeltaWeek 12 · June 13, 2026
Engraved portrait of Spencer Arrighetti
Spencer Arrighetti
HOU·P
Sell High high·0.95
Change to
Engraved portrait of Stephen Kolek
Stephen Kolek
KC·P
Hold med·0.50
Change to

Rest of Season Projection

SpencerCategoryStephen
87K 50
4.54ERA 4.03
1.44WHIP 1.30
9–19W 5–11
0SV0

Current Season

SpencerCategoryStephen
43K 19
1.34ERA 3.48
1.13WHIP 0.94
7W 3
0SV0

What Each Player's System Trusts

Spencer Arrighetti
  • babip_againstNOISEBABIP-against 0.234 suppressed and unstable — flattering the ERA
  • xeraSIGNALluck-free xERA 4.77 is 2.56 above the ERA — regression coming
Stephen Kolek
  • xeraNOISEskill near league average (3.37)

Spencer Arrighetti: 87 K / 4.54 ERA. Stephen Kolek: 50 K / 4.03 ERA. Different roster decisions — see individual verdicts.

Bare-stats comparison (narrative review pending).

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