{"sport":"mlb","slug":"mike-warren","bio":{"fullName":"Mike Warren","position":"P","team":"ATH","heightInches":73,"weightLbs":175,"birthDate":"1961-03-26","rookieSeason":1983,"lastSeason":1985,"status":"RET","externalIds":{"mlbam":"123947","chadwick":"db91a909","retro":"warrm001","wikidata":"Q6849217"}},"draft":{"year":1979,"round":null,"pick":null,"team":null,"undrafted":false},"statTables":[{"id":"pitching","label":"Pitching","columns":[{"key":"g"},{"key":"gs"},{"key":"w"},{"key":"l"},{"key":"sv"},{"key":"ip"},{"key":"so"},{"key":"bb"},{"key":"h"},{"key":"er"},{"key":"hr"},{"key":"era"},{"key":"whip"}],"rows":[{"season":1983,"seasonType":"REG","team":"ATH","gamesPlayed":12,"values":{"g":12,"gs":9,"w":5,"l":3,"sv":0,"ip":65.2,"so":30,"bb":18,"h":51,"er":30,"hr":4,"era":4.11,"whip":1.05},"rowScope":"team"},{"season":1984,"seasonType":"REG","team":"ATH","gamesPlayed":24,"values":{"g":24,"gs":12,"w":3,"l":6,"sv":0,"ip":90,"so":61,"bb":44,"h":104,"er":49,"hr":11,"era":4.9,"whip":1.64},"rowScope":"team"},{"season":1985,"seasonType":"REG","team":"ATH","gamesPlayed":16,"values":{"g":16,"gs":6,"w":1,"l":4,"sv":0,"ip":49,"so":48,"bb":38,"h":52,"er":36,"hr":13,"era":6.61,"whip":1.84},"rowScope":"team"}],"careerTotals":{"REG":{"g":52,"gs":27,"w":9,"l":13,"sv":0,"ip":204.2,"so":139,"bb":100,"h":207,"er":115,"hr":28,"era":5.06,"whip":1.5}}},{"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":1983,"seasonType":"REG","team":"ATH","values":{"ops_plus":null,"era_plus":98},"rowScope":"team"},{"season":1984,"seasonType":"REG","team":"ATH","values":{"ops_plus":null,"era_plus":82},"rowScope":"team"},{"season":1985,"seasonType":"REG","team":"ATH","values":{"ops_plus":null,"era_plus":65},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":null,"era_plus":81}},"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":"2026-07-03T02:49:47.141Z"}