Elina Svitolina earned a 6-2, 4-6, 6-4 win in 2 hours and 9 minutes to send World No 2 Iga Swiatek packing and reach her second Indian Wells semifinal and first since 2019.
Coco Gauff suffered a three-set defeat to Elina Svitolina in Dubai, with cameras capturing an emotional moment as she reacted to another costly double fault.
Elina Svitolina advanced to her fourth Grand Slam semifinal overall after dismantling the world No. 3 and two-time major champion, Coco Gauff, 6-1, 6-2.
World No.35 Yulia Putintseva stormed back from a set deficit to stun World No.1 Iga Swiatek while No.21 seed Elina Svitolina of Ukraine charged past two-time finalist Ons Jabeur in the third round of the women's singles action at the Wimbledon on Saturday.
Elina Svitolina becomes the sixth player among the top 10 seeds to be ousted from this year's Australian Open before the pre-quarters.
Their head-to-head coming into the match was equally split, with four wins each in eight meetings, and the Romanian having won their two most recent clashes at Wimbledon and in Doha.
Elina Svitolina dominated the second set from the word go and broke Karolina Pliskova in the very first game to eventually win first match of WTA Finals.
Williams will now face No 5 Elina Svitolina of Ukraine on Thursday to remain on course of her 24th Grand Slam.
Andreescu, 19, who clinched her second professional title at the Women's Tennis Association Premier 5 event in Toronto, needed just one hour and 55 minutes to reach her first Grand Slam quarterfinals.
On Sunday, Williams entered the US Open quarters for the 16th time in her career with a straight-set win over Petra Martic of Croatia at an electric Arthur Ashe Stadium.
