{"sport":"mlb","slug":"jocko-fields","bio":{"fullName":"Jocko Fields","position":"LF","team":"SF","heightInches":70,"weightLbs":160,"birthDate":"1864-10-20","rookieSeason":1887,"lastSeason":1892,"status":"RET","externalIds":{"mlbam":"114109","chadwick":"7bf39f52","retro":"fielj101","wikidata":"Q6207579"}},"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":1887,"seasonType":"REG","team":"PIT","gamesPlayed":43,"values":{"g":43,"ab":164,"r":26,"h":44,"doubles":9,"triples":2,"hr":0,"rbi":17,"sb":7,"bb":7,"so":13,"avg":0.268,"obp":0.306,"slg":0.348,"ops":0.654},"rowScope":"team"},{"season":1888,"seasonType":"REG","team":"PIT","gamesPlayed":45,"values":{"g":45,"ab":169,"r":22,"h":33,"doubles":7,"triples":2,"hr":1,"rbi":15,"sb":9,"bb":8,"so":19,"avg":0.195,"obp":0.232,"slg":0.278,"ops":0.51},"rowScope":"team"},{"season":1889,"seasonType":"REG","team":"PIT","gamesPlayed":75,"values":{"g":75,"ab":289,"r":41,"h":90,"doubles":22,"triples":5,"hr":2,"rbi":43,"sb":7,"bb":29,"so":30,"avg":0.311,"obp":0.376,"slg":0.443,"ops":0.819},"rowScope":"team"},{"season":1890,"seasonType":"REG","team":"Pittsburgh Burghers","gamesPlayed":126,"values":{"g":126,"ab":526,"r":101,"h":148,"doubles":18,"triples":20,"hr":9,"rbi":86,"sb":24,"bb":57,"so":52,"avg":0.281,"obp":0.355,"slg":0.443,"ops":0.798},"rowScope":"team"},{"season":1891,"seasonType":"REG","gamesPlayed":31,"gamesStarted":null,"values":{"g":31,"ab":105,"r":14,"h":25,"doubles":5,"triples":1,"hr":0,"rbi":10,"sb":1,"bb":14,"so":15,"avg":0.238,"slg":0.305,"obp":null,"ops":null},"team":"TOT","rowScope":"total"},{"season":1891,"seasonType":"REG","team":"PHI","gamesPlayed":8,"values":{"g":8,"ab":30,"r":4,"h":7,"doubles":2,"triples":1,"hr":0,"rbi":5,"sb":0,"bb":4,"so":2,"avg":0.233,"obp":0.324,"slg":0.367,"ops":0.691},"rowScope":"team"},{"season":1891,"seasonType":"REG","team":"PIT","gamesPlayed":23,"values":{"g":23,"ab":75,"r":10,"h":18,"doubles":3,"triples":0,"hr":0,"rbi":5,"sb":1,"bb":10,"so":13,"avg":0.24,"obp":0.337,"slg":0.28,"ops":0.617},"rowScope":"team"},{"season":1892,"seasonType":"REG","team":"SF","gamesPlayed":21,"values":{"g":21,"ab":66,"r":8,"h":18,"doubles":4,"triples":2,"hr":0,"rbi":5,"sb":2,"bb":9,"so":10,"avg":0.273,"obp":0.368,"slg":0.394,"ops":0.762},"rowScope":"team"}],"careerTotals":{"REG":{"g":341,"ab":1319,"r":212,"h":358,"doubles":65,"triples":32,"hr":12,"rbi":176,"sb":50,"bb":124,"so":139,"avg":0.271,"obp":0.338,"slg":0.397,"ops":0.735}}},{"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":1887,"seasonType":"REG","team":"PIT","gamesPlayed":1,"values":{"g":1,"gs":0,"w":0,"l":0,"sv":0,"ip":1,"so":0,"bb":2,"h":0,"er":0,"hr":0,"era":0,"whip":2},"rowScope":"team"}],"careerTotals":{"REG":{"g":1,"gs":0,"w":0,"l":0,"sv":0,"ip":1,"so":0,"bb":2,"h":0,"er":0,"hr":0,"era":0,"whip":2}}},{"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":1887,"seasonType":"REG","team":"PIT","values":{"ops_plus":86,"era_plus":null},"rowScope":"team"},{"season":1888,"seasonType":"REG","team":"PIT","values":{"ops_plus":69,"era_plus":null},"rowScope":"team"},{"season":1889,"seasonType":"REG","team":"PIT","values":{"ops_plus":137,"era_plus":null},"rowScope":"team"},{"season":1890,"seasonType":"REG","team":"Pittsburgh Burghers","values":{"ops_plus":121,"era_plus":null},"rowScope":"team"},{"season":1891,"seasonType":"REG","gamesPlayed":null,"gamesStarted":null,"values":{"ops_plus":null,"era_plus":null},"team":"TOT","rowScope":"total"},{"season":1891,"seasonType":"REG","team":"PHI","values":{"ops_plus":109,"era_plus":null},"rowScope":"team"},{"season":1891,"seasonType":"REG","team":"PIT","values":{"ops_plus":85,"era_plus":null},"rowScope":"team"},{"season":1892,"seasonType":"REG","team":"SF","values":{"ops_plus":136,"era_plus":null},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":113,"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"}