Where our facts come from

Every rule, measurement and ranking on RacketWiki links to a source. Sources are ranked in five tiers, and a higher tier wins when two disagree.

1. Rules, court dimensions and equipment limits cite a Tier 1 source.
2. Rankings and results cite the body that publishes them, with a date.
3. Encyclopaedias, including Wikipedia, point us to primary sources. They are never the citation.
4. Each fact shows the date it was last checked.