Why the tennis balls at the US Open are different for women and men, as Iga Swiatek calls them 'horrible'
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How Many Balls Do They Use at the US Open? 14 Amazing Facts You Didn't Know. | Entrepreneur
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US Open tennis balls: Iga Swiatek among female players criticising 'horrible' balls - BBC Sport
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All You Need to Know About US Open 2020 Balls - EssentiallySports
All You Need to Know About US Open 2020 Balls - EssentiallySports
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Why men and women use different tennis balls at US Open as row starts with female players slamming them as 'horrible' | The US Sun
Women demand equality in US Open ball row
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