{"sport":"mlb","slug":"duke-kenworthy","bio":{"fullName":"Duke Kenworthy","position":"2B","team":"BAL","heightInches":67,"weightLbs":165,"birthDate":"1886-07-04","rookieSeason":1912,"lastSeason":1917,"status":"RET","externalIds":{"mlbam":"117002","chadwick":"fb5826c2","retro":"kenwd101","wikidata":"Q4909717"}},"draft":null,"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":1912,"seasonType":"REG","team":"MIN","gamesPlayed":12,"values":{"g":12,"ab":38,"r":6,"h":9,"doubles":1,"triples":0,"hr":0,"rbi":2,"sb":3,"bb":2,"so":null,"avg":0.237,"obp":0.293,"slg":0.263,"ops":0.556},"rowScope":"team"},{"season":1914,"seasonType":"REG","team":"Kansas City Packers","gamesPlayed":146,"values":{"g":146,"ab":545,"r":93,"h":173,"doubles":40,"triples":14,"hr":15,"rbi":91,"sb":37,"bb":36,"so":44,"avg":0.317,"obp":0.372,"slg":0.525,"ops":0.897},"rowScope":"team"},{"season":1915,"seasonType":"REG","team":"Kansas City Packers","gamesPlayed":122,"values":{"g":122,"ab":396,"r":59,"h":118,"doubles":30,"triples":7,"hr":3,"rbi":52,"sb":20,"bb":28,"so":32,"avg":0.298,"obp":0.355,"slg":0.432,"ops":0.787},"rowScope":"team"},{"season":1917,"seasonType":"REG","team":"BAL","gamesPlayed":5,"values":{"g":5,"ab":10,"r":1,"h":1,"doubles":0,"triples":0,"hr":0,"rbi":1,"sb":1,"bb":1,"so":1,"avg":0.1,"obp":0.182,"slg":0.1,"ops":0.282},"rowScope":"team"}],"careerTotals":{"REG":{"g":285,"ab":989,"r":159,"h":301,"doubles":71,"triples":21,"hr":18,"rbi":146,"sb":61,"bb":67,"so":77,"avg":0.304,"obp":0.36,"slg":0.473,"ops":0.833}}},{"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":1912,"seasonType":"REG","team":"MIN","values":{"ops_plus":60,"era_plus":null},"rowScope":"team"},{"season":1914,"seasonType":"REG","team":"Kansas City Packers","values":{"ops_plus":159,"era_plus":null},"rowScope":"team"},{"season":1915,"seasonType":"REG","team":"Kansas City Packers","values":{"ops_plus":136,"era_plus":null},"rowScope":"team"},{"season":1917,"seasonType":"REG","team":"BAL","values":{"ops_plus":-11,"era_plus":null},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":145,"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":"2026-07-03T07:40:28.886Z"}