{"sport":"mlb","slug":"roy-foster","bio":{"fullName":"Roy Foster","position":"LF","team":"CLE","heightInches":72,"weightLbs":185,"birthDate":"1945-07-29","rookieSeason":1970,"lastSeason":1972,"status":"RET","externalIds":{"mlbam":"114338","chadwick":"d9755362","retro":"fostr101","wikidata":"Q7372810"}},"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":1970,"seasonType":"REG","team":"CLE","gamesPlayed":139,"values":{"g":139,"ab":477,"r":66,"h":128,"doubles":26,"triples":0,"hr":23,"rbi":60,"sb":3,"bb":54,"so":75,"avg":0.268,"obp":0.357,"slg":0.468,"ops":0.825},"rowScope":"team"},{"season":1971,"seasonType":"REG","team":"CLE","gamesPlayed":125,"values":{"g":125,"ab":396,"r":51,"h":97,"doubles":21,"triples":1,"hr":18,"rbi":45,"sb":6,"bb":35,"so":48,"avg":0.245,"obp":0.314,"slg":0.439,"ops":0.753},"rowScope":"team"},{"season":1972,"seasonType":"REG","team":"CLE","gamesPlayed":73,"values":{"g":73,"ab":143,"r":19,"h":32,"doubles":4,"triples":0,"hr":4,"rbi":13,"sb":0,"bb":21,"so":23,"avg":0.224,"obp":0.325,"slg":0.336,"ops":0.661},"rowScope":"team"}],"careerTotals":{"REG":{"g":337,"ab":1016,"r":136,"h":257,"doubles":51,"triples":1,"hr":45,"rbi":118,"sb":9,"bb":110,"so":146,"avg":0.253,"obp":0.336,"slg":0.438,"ops":0.774}}},{"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":1970,"seasonType":"REG","team":"CLE","values":{"ops_plus":129,"era_plus":null},"rowScope":"team"},{"season":1971,"seasonType":"REG","team":"CLE","values":{"ops_plus":131,"era_plus":null},"rowScope":"team"},{"season":1972,"seasonType":"REG","team":"CLE","values":{"ops_plus":113,"era_plus":null},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":127,"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":"2026-07-03T03:00:12.318Z"}