Composite
Headline POD score. For batters: weighted sum of TB + R + RBI + BB + HBP with bonuses for HR and SB and a small penalty for K. For pitchers: the Bill James Game Score below. Both get multiplied by an upset bonus when the player's team was a pre-game underdog.
Game Score (pitchers)
Bill James formula: 50 + IP + (2·IP over 4) − 2·H − 4·ER − 2·UER − BB + SO. 50 ≈ average start, 70+ is dominant, 90+ historic.
Upset Pts
Extra boost applied to Composite when the player's team was an underdog at first pitch. = 50% − pregame WP when WP < 50%. Beating a heavy favorite means more.
Pregame WP
Elo-derived probability the player's team would win, with a +24-Elo home-field advantage. Computed before first pitch — not the live mid-game value.
Breakouts (z-score)
How far a player's last-5-game OPS is from their season OPS, in standard errors. +1σ = strong outlier riser; −1σ faller. Requires 20+ season PA and 8+ window PA.
Elo / Power Rank
Team rating starting at 1500, updates ±K with margin-of-victory after each game. Higher = stronger team. Used for projected WP and rankings.
Spray Zones
From iScore PBP: where the ball was first fielded. LF / CF / RF = outfield slices. IF-L = 3B/SS/P. IF-R = 1B/2B/C. HR = over the fence (no fielder).
vs Role / TTO
Batter splits by pitcher role (Starter vs Reliever) and Times Through the Order (1st / 2nd / 3rd+ PA against the same pitcher in a game).