{"sport":"mlb","slug":"marty-brown","bio":{"fullName":"Marty Brown","position":"3B","team":"BAL","heightInches":73,"weightLbs":190,"birthDate":"1963-01-23","rookieSeason":1988,"lastSeason":1990,"status":"RET","externalIds":{"mlbam":"111574","chadwick":"dd5a27aa","retro":"browm004","wikidata":"Q6777386"}},"draft":{"year":1985,"round":null,"pick":null,"team":null,"undrafted":false},"statTables":[{"id":"batting","label":"Batting","columns":[{"key":"g"},{"key":"ab"},{"key":"r"},{"key":"h"},{"key":"doubles"},{"key":"triples"},{"key":"hr"},{"key":"rbi"},{"key":"sb"},{"key":"bb"},{"key":"so"},{"key":"avg"},{"key":"obp"},{"key":"slg"},{"key":"ops"}],"rows":[{"season":1988,"seasonType":"REG","team":"CIN","gamesPlayed":10,"values":{"g":10,"ab":16,"r":0,"h":3,"doubles":1,"triples":0,"hr":0,"rbi":2,"sb":0,"bb":1,"so":2,"avg":0.188,"obp":0.235,"slg":0.25,"ops":0.485},"rowScope":"team"},{"season":1989,"seasonType":"REG","team":"CIN","gamesPlayed":16,"values":{"g":16,"ab":30,"r":2,"h":5,"doubles":1,"triples":0,"hr":0,"rbi":4,"sb":0,"bb":4,"so":9,"avg":0.167,"obp":0.257,"slg":0.2,"ops":0.457},"rowScope":"team"},{"season":1990,"seasonType":"REG","team":"BAL","gamesPlayed":9,"values":{"g":9,"ab":15,"r":1,"h":3,"doubles":0,"triples":0,"hr":0,"rbi":0,"sb":0,"bb":1,"so":7,"avg":0.2,"obp":0.25,"slg":0.2,"ops":0.45},"rowScope":"team"}],"careerTotals":{"REG":{"g":35,"ab":61,"r":3,"h":11,"doubles":2,"triples":0,"hr":0,"rbi":6,"sb":0,"bb":6,"so":18,"avg":0.18,"obp":0.25,"slg":0.213,"ops":0.463}}},{"id":"advanced","label":"Advanced (League-Relative)","columns":[{"key":"ops_plus","label":"OPS+","description":"On-base plus slugging vs the player's own season+league (100 = league average). Park-unadjusted; OBP uses a consistent (H+BB)/(AB+BB) rate. Higher is better.","format":"int","higherIsBetter":true},{"key":"era_plus","label":"ERA+","description":"Earned-run average vs the player's own season+league (100 = league average). Park-unadjusted. Higher is better.","format":"int","higherIsBetter":true}],"rows":[{"season":1988,"seasonType":"REG","team":"CIN","values":{"ops_plus":44,"era_plus":null},"rowScope":"team"},{"season":1989,"seasonType":"REG","team":"CIN","values":{"ops_plus":38,"era_plus":null},"rowScope":"team"},{"season":1990,"seasonType":"REG","team":"BAL","values":{"ops_plus":29,"era_plus":null},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":37,"era_plus":null}},"advancedMeta":{"method":"computed in-house from MLB StatsAPI season batting/pitching lines, normalized to each player's own (season, league) baseline","formulas":{"era_plus":"100 * lgERA / playerERA (league ERA = 9 * ΣER / ΣIP over the season+league)","ops_plus":"100 * (OBP/lgOBP + SLG/lgSLG - 1)","career_era_plus":"innings-weighted league ERA / career ERA (B-Ref method)","career_ops_plus":"AB-weighted OBP & SLG against AB-weighted league rates"},"caveats":["PARK-UNADJUSTED: no park-factor data exists in the corpus, so these are league-relative but not park-adjusted (true B-Ref ERA+/OPS+ also divide by a park factor)","OBP baseline uses a consistent (H+BB)/(AB+BB) reached-base rate for BOTH player and league — the source feed carries no HBP or SF, so this is not the full (H+BB+HBP)/(AB+BB+HBP+SF) OBP; SLG is exact from the hit-type columns","league resolved from team code + season (most-recently-founded franchise existing by that season); the same resolver builds the baseline and looks up the player, so ratios stay internally coherent","a (season, league) bucket below the sample floor (3000 AB batting / 1000 IP pitching) yields null — no noisy baselines","regular season only; postseason lines are excluded from league baselines and metrics","AL and NL and each historical/Negro league are normalized separately — never blended across leagues or eras"]}}],"dataSources":["MLB StatsAPI (statsapi.mlb.com — official public league API; facts only, raw payloads not republished)"],"generatedAt":"2026-07-03T02:37:06.742Z"}