Poland’s Iga Swiatek reacts during her women’s singles final match. Swiatek overcame a shaky start to defeat Wimbledon champion Marketa Vondrousova in straight sets in her opening WTA Finals game in Cancun on Monday.

Poland's Iga Swiatek reacts during her women's singles final match. Swiatek overcame a shaky start to defeat Wimbledon champion Marketa Vondrousova in straight sets in her opening WTA Finals game in Cancun on Monday.