In a match with prodigious momentum shifts, a battle of two fast-rising, big-hitting future stars, Naomi Osaka of Japan, the 19th seed, takes on Aryna Sabalenka. Both players made important breakthroughs on tour that year. In March, Osaka won one of the most prestigious tournaments outside a major, the BNP Paribas Open in Indian Wells. Sabalenka snatched her first WTA title the week before the US Open, at the Connecticut Open in New Haven. With both players demonstrating the firepower that has catapulted them up the rankings, who can hold their nerve and reach a first career quarterfinal at a Slam?

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