On Monday, Rybakina hit just four in a straight-sets win over Marta Kostyuk of Ukraine, but she was impressive nonetheless. Kostyuk, ranked No. 39 in the world (to her opponent’s No. 4), beat Rybakina in the sole match they’ve played, in Adelaide this year. While their straight-sets contest was spirited, Rybakina was able to even that score …
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