{"sport":"mlb","slug":"mike-bertotti","bio":{"fullName":"Mike Bertotti","position":"P","team":"CWS","heightInches":73,"weightLbs":185,"birthDate":"1970-01-18","rookieSeason":1995,"lastSeason":1997,"status":"RET","externalIds":{"mlbam":"110945","chadwick":"a036ba11","retro":"bertm001","wikidata":"Q6846039"}},"draft":{"year":1991,"round":null,"pick":null,"team":null,"undrafted":false},"statTables":[{"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":1995,"seasonType":"REG","team":"CWS","gamesPlayed":4,"values":{"g":4,"gs":4,"w":1,"l":1,"sv":0,"ip":14.1,"so":15,"bb":11,"h":23,"er":20,"hr":6,"era":12.56,"whip":2.37},"rowScope":"team"},{"season":1996,"seasonType":"REG","team":"CWS","gamesPlayed":15,"values":{"g":15,"gs":2,"w":2,"l":0,"sv":0,"ip":28,"so":19,"bb":20,"h":28,"er":16,"hr":5,"era":5.14,"whip":1.71},"rowScope":"team"},{"season":1997,"seasonType":"REG","team":"CWS","gamesPlayed":9,"values":{"g":9,"gs":0,"w":0,"l":0,"sv":0,"ip":3.2,"so":4,"bb":2,"h":9,"er":3,"hr":0,"era":7.36,"whip":3},"rowScope":"team"}],"careerTotals":{"REG":{"g":28,"gs":6,"w":3,"l":1,"sv":0,"ip":46,"so":38,"bb":33,"h":60,"er":39,"hr":11,"era":7.63,"whip":2.02}}},{"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":1995,"seasonType":"REG","team":"CWS","values":{"ops_plus":null,"era_plus":37},"rowScope":"team"},{"season":1996,"seasonType":"REG","team":"CWS","values":{"ops_plus":null,"era_plus":97},"rowScope":"team"},{"season":1997,"seasonType":"REG","team":"CWS","values":{"ops_plus":null,"era_plus":60},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":null,"era_plus":63}},"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":"2026-07-03T02:26:44.323Z"}