UPDATE 1-Tennis-Ukrainians Kostyuk and Svitolina make strong starts at US Open

(Adds Svitolina's match result) By Shrivathsa Sridhar and Janina Nuno Rios NEW YORK, Aug 30 (Reuters) – Ukraine's Marta Kostyuk and Elina Svitolina made strong starts to their U.S. Open campaigns on

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