{"sport":"mlb","slug":"jack-burns-1903","bio":{"fullName":"Jack Burns","position":"2B","team":"DET","heightInches":70,"weightLbs":160,"birthDate":"1878-05-13","rookieSeason":1903,"lastSeason":1904,"status":"RET","externalIds":{"mlbam":"111751","chadwick":"43c28e6e","retro":"burnj104","wikidata":"Q6111485"}},"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":1903,"seasonType":"REG","team":"DET","gamesPlayed":11,"values":{"g":11,"ab":37,"r":2,"h":10,"doubles":0,"triples":0,"hr":0,"rbi":3,"sb":0,"bb":1,"so":null,"avg":0.27,"obp":0.325,"slg":0.27,"ops":0.595},"rowScope":"team"},{"season":1904,"seasonType":"REG","team":"DET","gamesPlayed":4,"values":{"g":4,"ab":16,"r":3,"h":2,"doubles":0,"triples":0,"hr":0,"rbi":1,"sb":1,"bb":1,"so":null,"avg":0.125,"obp":0.176,"slg":0.125,"ops":0.301},"rowScope":"team"}],"careerTotals":{"REG":{"g":15,"ab":53,"r":5,"h":12,"doubles":0,"triples":0,"hr":0,"rbi":4,"sb":1,"bb":2,"so":null,"avg":0.226,"obp":0.281,"slg":0.226,"ops":0.507}}},{"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":1903,"seasonType":"REG","team":"DET","values":{"ops_plus":76,"era_plus":null},"rowScope":"team"},{"season":1904,"seasonType":"REG","team":"DET","values":{"ops_plus":0,"era_plus":null},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":54,"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":"2026-07-03T08:01:23.026Z"}