Here are a few links that you may find useful and that may come up during the discussion:
- Jorge Capestany's video explaining the logic and physics behind the use of different balls for different players.
 - International Tennis Federation (ITF) endorsement of ROGY.
 - USTA's suggested competencies for the various ball colors.
 - 10andUnderTennis site
 - The facilities where I teach using these formats: Lexington County Tennis Complex and Cayce Tennis and Fitness Center.
 - An Australian study comparing yellow vs green balls during high level 9-10 year-old player matches
 

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