Naomi Osaka battled into the last 16 of the Qatar Open on Tuesday but Coco Gauff and Ons Jabeur crashed to surprise second-round exits with straight-sets defeats.
Sixth seed Ons Jabeur and former champion Caroline Wozniacki fell victim to exciting young Russians in the Australian Open second round Wednesday
After earning her first win of the week at the season-ending championships in Cancun, Tunisia's Ons Jabeur choked back tears as she spoke on court
Iga Swiatek overcame a shaky start to defeat Wimbledon champion Marketa Vondrousova in straight sets in her opening WTA Finals match.
Ons Jabeur was coming off a fourth-round showing at the US Open, where she battled illness in the opening rounds.
China's Zheng Qinwen thrashed fifth seed and last year's US Open runner-up Ons Jabeur 6-2, 6-4 on Monday to reach her first Grand Slam quarter-final
Tunisian fifth seed Jabeur, whose own US Open campaign has been disrupted by a flu virus, completed a 5-7, 7-6 (7/5), 6-3 victory to subdue Bouzkova in 2hr 56min.
Third seed Daniil Medvedev raced into the US Open second round on Tuesday with a 6-1, 6-1, 6-0 victory over Hungary's Attila Balazs
Wimbledon saw Carlos Alcaraz dethrone Novak Djokovic, Marketa Vondrousova take a surprise women's title while there was also rain, records and royals
World number six Ons Jabeur was beaten 6-4, 6-4 by unseeded Czech Marketa Vondrousova on Saturday,