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Rising performance-efficiency demands in female junior tennis: A longitudinal analysis of ITF World Tennis Tour Juniors rankings, 2004–2025
Long-term changes in ranking-point production efficiency among female players on the ITF World Tennis Tour Juniors were examined between 2004 and 2025. Year-end ranking data comprised 8,510 player-year observations from 5,919 players aged 12–18 years. Elite status was defined annually using a two-s
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