Serena Williams heads into this year's French Open with questions surrounding her fitness while Naomi Osaka needs to rediscover her best form to solidify her position at the top of the women's game.
Simona Halep awaits either Dutch seventh seed Kiki Bertens, a finalist in Madrid last year, or 2017 US Open champion Sloane Stephens in the final.
Former Roland Garros doubles champions Caroline Garcia and Kristina Mladenovic beat Simona Halep and Monica Niculescu to secure a final date against Australia.
Ashleigh Barty leads Australia's hopes of reaching a first Fed Cup final since 1993 when they face 2017 runners up Belarus in Brisbane.
Roger Federer rolled back the years with a dominant display to serve notice of his intent to land his 101st career title in Sunday's final.
Roger Federer produced an excellent all-round performance despite being tested by the world number 103 Filip Krajinovic.
Serena Williams beat Victoria Azarenka 7-5, 6-3 in an electrifying Indian Wells clash of former world number ones.
Japan's Naomi Osaka retained the world number one spot.
Serena Williams staved off a spirited fight from top seed Simona Halep of Romania to enter the quarterfinals of the Australia Open.
Naomi Osaka emerged from an error-strewn first set against crafty Latvian Anastasija Sevastova to win 4-6, 6-3, 6-4.
Serena Williams won her 23rd major Down Under two years ago while two months pregnant.
Naomi Osaka's win equals her best performance at the Australian Open, where she reached the last 16 in 2018 but lost to Simona Halep.
The pressure on the reigning French Open champion will only increase in her next round.
The Russian five-time Grand Slam champion was forced to stay up late in her second-round match.
Simona Halep had to dig deep for a come-from-behind win against Kaia Kanepi in the first round of the Australian Open.
Serena Williams won her 23rd title and seventh at Melbourne Park while eight weeks pregnant two years ago.
Serena Williams is gunning to match Margaret Court's record of singles majors and claim an eighth Australian Open crown.