Barbora Krejcikova saved a remarkable 11 out of 12 break points to defeat Coco Gauff 7-5 6-4 to advance to the semi-finals at the WTA Finals in Riyadh as the winner of the Orange Group and dump defending champion Iga Swiatek out.
Krejcikova, Gauff make last four at WTA Finals with Swiatek eliminated
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