Sabalenka downs Muchova to win WTA Finals opener

Aryna Sabalenka battled past Karolina Muchova in straight sets to make a winning start at the season-ending WTA Finals in Indian Wells on Monday.In Monday's other group game, WTA Finals debutant Mirra Andreeva motored past Ukraine's Elina Svitolina in straight sets, winning 6-4, 6-0, despite overcom

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