{
  "name": "UTR Rating Chart 2026: Algorithm and Comparison Source Extract",
  "version": "1.0",
  "published": "2026-08-27",
  "accessed": "2026-08-27",
  "license": {
    "original_compilation": "CC BY 4.0",
    "notice": "Third-party facts remain subject to each source's terms. This editorial extract does not relicense UTR Sports, USTA, ITF or WTN data."
  },
  "method": "Stakhovsky Tennis separates current algorithm facts, Fall 2019 college observations and USTA Northern California event guidance. The extract does not claim a universal conversion.",
  "records": [
    {"metric":"scale_minimum","group":"all players","value":1.00,"unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"UTR Sports","source_url":"https://www.utrsports.net/pages/how-utr-works","definition":"Published lower endpoint","limit":"Higher UTR means stronger performance."},
    {"metric":"scale_maximum","group":"all players","value":16.50,"unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"UTR Sports","source_url":"https://www.utrsports.net/pages/how-utr-works","definition":"Published upper endpoint","limit":"Live individual ratings are not reproduced."},
    {"metric":"rolling_window","group":"eligible results","value":12,"unit":"months","data_period":"current at 2026-08-27","source_organisation":"UTR Sports","source_url":"https://support.universaltennis.com/en/support/solutions/articles/9000233354-faq-universal-tennis-rating-utr-rating-algorithm","definition":"Rolling result window","limit":"Old results leave the calculation."},
    {"metric":"maximum_recent_results","group":"eligible results","value":30,"unit":"match ratings","data_period":"current at 2026-08-27","source_organisation":"UTR Sports","source_url":"https://support.universaltennis.com/en/support/solutions/articles/9000233354-faq-universal-tennis-rating-utr-rating-algorithm","definition":"Maximum recent eligible match ratings","limit":"Tied-day exceptions can affect the count."},
    {"metric":"reliable_result_count","group":"eligible results","value":"roughly 5 to 6","unit":"results","data_period":"current at 2026-08-27","source_organisation":"UTR Sports","source_url":"https://www.utrsports.net/pages/how-utr-works","definition":"Approximate result count for reliability","limit":"UTR pages use slightly different wording."},
    {"metric":"utr_full_roster_range","group":"Division I men","value":"8 to 14","unit":"UTR","data_period":"Fall 2019","source_organisation":"UTR Sports","source_url":"https://www.utrsports.net/blogs/news/data-deep-dive-range-of-utrs-in-college-tennis/","definition":"Observed full-roster range","limit":"Historical observation, not a 2026 cutoff."},
    {"metric":"utr_full_roster_range","group":"Division I women","value":"5 to 12","unit":"UTR","data_period":"Fall 2019","source_organisation":"UTR Sports","source_url":"https://www.utrsports.net/blogs/news/data-deep-dive-range-of-utrs-in-college-tennis/","definition":"Observed full-roster range","limit":"Historical observation, not a 2026 cutoff."},
    {"metric":"utr_full_roster_range","group":"Division II men","value":"5 to 13","unit":"UTR","data_period":"Fall 2019","source_organisation":"UTR Sports","source_url":"https://www.utrsports.net/blogs/news/data-deep-dive-range-of-utrs-in-college-tennis/","definition":"Observed full-roster range","limit":"Historical observation, not a 2026 cutoff."},
    {"metric":"utr_full_roster_range","group":"Division II women","value":"2 to 10","unit":"UTR","data_period":"Fall 2019","source_organisation":"UTR Sports","source_url":"https://www.utrsports.net/blogs/news/data-deep-dive-range-of-utrs-in-college-tennis/","definition":"Observed full-roster range","limit":"Historical observation, not a 2026 cutoff."},
    {"metric":"ntrp_event_range","group":"men NTRP 4.0","value":"6 to 8","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"ntrp_event_range","group":"women NTRP 4.0","value":"4 to 6","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"ntrp_event_range","group":"men NTRP 4.5","value":"8 to 10","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"ntrp_event_range","group":"women NTRP 4.5","value":"6 to 8","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"ntrp_event_range","group":"men NTRP 5.0","value":"10 to 12","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"ntrp_event_range","group":"women NTRP 5.0","value":"8 to 10","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"ntrp_event_range","group":"men NTRP 5.5+","value":"11+","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"ntrp_event_range","group":"women NTRP 5.5+","value":"9+","unit":"UTR","data_period":"current at 2026-08-27","source_organisation":"USTA Northern California","source_url":"https://www.usta.com/en/home/play/adult-tennis/programs/northerncalifornia/generation-gap.html","definition":"Generation Gap event guidance","limit":"Regional event range, not a universal conversion."},
    {"metric":"wtn_scale_start","group":"all players","value":40,"unit":"WTN","data_period":"current at 2026-08-27","source_organisation":"International Tennis Federation","source_url":"https://worldtennisnumber.com/eng/how-wtn-works","definition":"Published recreational endpoint","limit":"Lower WTN means stronger performance."},
    {"metric":"wtn_scale_elite","group":"all players","value":1,"unit":"WTN","data_period":"current at 2026-08-27","source_organisation":"International Tennis Federation","source_url":"https://worldtennisnumber.com/eng/how-wtn-works","definition":"Published elite endpoint","limit":"No official direct UTR conversion located."}
  ]
}