{"sport":"mlb","slug":"bart-cantz","bio":{"fullName":"Bart Cantz","position":"C","team":null,"heightInches":69,"weightLbs":152,"birthDate":"1860-01-29","rookieSeason":1888,"lastSeason":1890,"status":"RET","externalIds":{"mlbam":"111968","chadwick":"2849366b","retro":"cantb101","wikidata":"Q4865053"}},"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":1888,"seasonType":"REG","team":"Baltimore Orioles","gamesPlayed":37,"values":{"g":37,"ab":126,"r":7,"h":21,"doubles":2,"triples":1,"hr":0,"rbi":9,"sb":0,"bb":2,"so":null,"avg":0.167,"obp":0.18,"slg":0.198,"ops":0.378},"rowScope":"team"},{"season":1889,"seasonType":"REG","team":"Baltimore Orioles","gamesPlayed":20,"values":{"g":20,"ab":69,"r":6,"h":12,"doubles":2,"triples":0,"hr":0,"rbi":8,"sb":2,"bb":4,"so":14,"avg":0.174,"obp":0.219,"slg":0.203,"ops":0.422},"rowScope":"team"},{"season":1890,"seasonType":"REG","team":"Philadelphia Athletics","gamesPlayed":5,"values":{"g":5,"ab":22,"r":1,"h":1,"doubles":0,"triples":0,"hr":0,"rbi":1,"sb":0,"bb":0,"so":null,"avg":0.045,"obp":0.045,"slg":0.045,"ops":0.09},"rowScope":"team"}],"careerTotals":{"REG":{"g":62,"ab":217,"r":14,"h":34,"doubles":4,"triples":1,"hr":0,"rbi":18,"sb":2,"bb":6,"so":14,"avg":0.157,"obp":0.179,"slg":0.184,"ops":0.363}}},{"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":1888,"seasonType":"REG","team":"Baltimore Orioles","values":{"ops_plus":26,"era_plus":null},"rowScope":"team"},{"season":1889,"seasonType":"REG","team":"Baltimore Orioles","values":{"ops_plus":25,"era_plus":null},"rowScope":"team"},{"season":1890,"seasonType":"REG","team":"Philadelphia Athletics","values":{"ops_plus":-73,"era_plus":null},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":15,"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":"2026-07-03T08:11:48.216Z"}