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Start with the full category, then apply the exact boundary: Use the playing surfaces of the four Grand Slams in 2024. You only need one qualifying answer. A longer name is not automatically rarer.
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Australian OpenAustralian Open is one of the four tennis Grand Slam tournaments in the 2024 edition.
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Australian OpenAustralian Open is one of the four tennis Grand Slam tournaments in the 2024 edition.Aliases: AO
65US OpenUS Open is one of the four tennis Grand Slam tournaments in the 2024 edition.Aliases: U.S. Open · United States Open
45Why these answers qualify
Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: ITF · Grand Slam tournaments
Reference version: 2026-09-19. See our answer policy for how we handle aliases and omissions.