Karolina Pliskova's defeat to Anastasia Pavlyuchenkova means that two of the top three seeds are now out of the women's draw at the Australian Open.
Caroline Wozniacki brings the curtain down on a career that saw her win 30 WTA titles, with her sole Grand Slam triumph coming in 2018 at Australian Open.
Australian Open: Serena Williams knocked out in 3rd round after losing 4-6, 7-6, 5-7 to China's Qiang Wang.
Serena Williams faces China's 27th seed Wang Qiang next and could meet her fellow American Coco Gauff in the quarter-finals in Melbourne.
Serena Williams was never in serious trouble against the 70th-ranked Slovenian Zidansek, winning 6-2, 6-3 at Rod Laver Arena.
Australian Open: Defending champion Novak Djokovic dropped his first set since 2006 in the opening round before recovering to beat Jan-Lennard Struff 7-6 (7/5), 6-2, 2-6, 6-1.
Serena Williams launched her quest for a 24th Grand Slam title with a quickfire demolition of Anastasia Potapova at the Australian Open.
Naomi Osaka posted a picture with her 2018 US Open final counter-part Serena Williams on Twitter but what stood out was her caption.
Serena Williams is looking to finally complete her long quest for a record-equalling 24th Grand Slam title at the Australian Open.
Serena Williams ended a three-year title drought as she outclassed Jessica Pegula 6-3, 6-4 to win the WTA Auckland Classic on Sunday.
Serena Williams, at her imperious best, rapidly eliminated third-seed Amanda Anisimova 6-1, 6-1 to set up a showdown against Jessica Pegula.
Serena Williams defeated Laura Siegemund 6-4,6-3 to reach the semi-finals of the WTA Auckland Classic while Caroline Wozniacki beat defending champion Julia Georges 6-1, 6-4.
Serena Williams will face Germany's Laura Siegemund in the WTA Auckland Classic quarter-final
With an eye on the Australian Open later in the month, Serena Williams worked her way into a blistering performance against Camila Giorgi.
Naomi Osaka bumped into Beyonce and her husband Jay-Z while still "depressed" after losing in the fourth round at the US Open last year.
Serena Williams and Svetlana Kuznetsova are set to resume their 16-year rivalry after being drawn on Saturday to face each other in the first round of next week's Auckland WTA Classic.
Bianca Andreescu was billed as the top-seed in Auckland WTA Classic but she has been forced out by "ongoing knee issues", tournament organisers said.
Tennis ace Serena Williams practiced her punches with some help from legendary boxer Mike Tyson.