The US Open is switching tennis balls for women's matches so they're the same ones the men use

Men and women will use the same tennis ball this year at the U.S. Open, satisfying some women who complained last year they were hitting an inferior product.

Unique Rules US Open Players and Spectators Must Follow

The U.S Open replaces human line judges with optical technology : NPR

Jessica Pegula—America's Top-Ranked Tennis Player—Looks to the US Open

The lingering debate on tennis balls used at ATP and WTA tournaments is a ball of confusion

US Open 2021: Ball boy channels Kramer, why are ball persons adults? Tennis news

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What determines a ball to be out in tennis? - Quora

At U.S. Open, Do Women Play With Faster Tennis Balls? - WSJ

US Open to use same tennis balls for women and men - ESPN

Paula Badosa's Run at Indian Wells Embodied Tennis in the Pandemic

The lingering debate on tennis balls used at ATP and WTA tournaments is a ball of confusion

U.S. Open: Why not all tennis balls are alike