Madison Keys is the second-oldest woman to claim her first Australian Open singles title in the Open era.
Madison Keys, 29, is the fourth-oldest first-time Grand Slam champion in the professional era.
Ashleigh Barty stunningly lost her chance to regain the number one world ranking when the Australian was beaten in straight sets by Russian Svetlana Kuznetsova.
Former US Open champion Svetlana Kuznetsova has joined a growing list of players who have decided not to play in this year's tournament due to concerns over the COVID-19 pandemic.
World number nine Svetlana Kuznetsova marched into the Stuttgart Grand Prix final on Saturday, crushing fellow Russian Elena Dementieva 6-4, 6-2 in just 67 minutes.
The Canadian set the tournament alight with a scintillating, three-set win over Maria Sharapova on Tuesday after her outspoken comments about the Russian returning from her 15-month doping ban, including calling her a cheater.
Compatriot Elena Dementieva added her name to the tournament's lengthy casualty list when she withdrew with a left thigh muscle injury.
In another quarter-final at the Dubai Open, Russian third seed Maria Sharapova beat Switzerland's Martina Hingis.
She will play number 14 seed Daniela Hantuchova of Slovakia, who wore down number 12 Li Na of China 7-5 4-6 6-1.
The American ace beat Vera Zvonareva while US Open champion Kuznetsova accounted for Wimbledon champion Maria Sharapova in the semi-finals of the China Open.
Svetlana Kuznetsova won her second grand slam title when she outplayed fellow Russian and world number one Dinara Safina 6-4 6-2 in the French Open final on Saturday.
Svetlana Kuznetsova reached the final of the Dubai Championships by beating Serbian fourth seed Jelena Jankovic 5-7, 6-4, 6-3.
Poland's Agnieszka Radwanska stayed patient in the face of a barrage of big serving to advance to the last four of the WTA Finals for the third time in a row with a 7-5, 6-3 victory over Karolina Pliskova on Friday.
Roger Federer had picked out the Russian as his favourite player on the women's tour.
Azarenka punished her Russian opponent's weak serve to wrap up the final in 80 minutes in relentless humidity under a searing sun in the early afternoon encounter on the Key Biscayne hardcourt.
Svetlana Kuznetsova thrashed China's Zheng Jie 6-1, 6-3 to become the first player through to the semi-finals of the Montreal Cup on Friday.
"If someone wants to make a fashion statement they should go on stage, not on a tennis court," she said with Sharapova in mind.
Twice Grand Slam champion Svetlana Kuznetsova pulled out of Wimbledon on Wednesday with an abdominal strain.
French Open champion Svetlana Kuznetsova and her fellow Russian Elena Dementieva won their opening round matches at the Sydney International Sunday, one of the major lead-up events to the Australian Open.
Leander Paes and Lukas Dlouhy staged a magnificent recovery to beat South Africa's Wesley Moodie and Belgium's Dick Norman and win the men's doubles title at the French Open on Saturday.
Dinara Safina and Svetlana Kuznetsova, the world's best women claycourters in 2009, relied on their wealth of experience to set up an all-Russian final at the French Open on Thursday.
Laura Siegemund entered the record books with her defeat of fifth-seeded Xiyu Wang of China in four hours, nine minutes at the Thailand Open in Hua Hin on Wednesday.
Russia's Svetlana Kuznetsova ended Jelena Jankovic's two-year reign as Italian Open champion when she beat the Serbian 6-1, 7-6 Thursday to go through to the semi-finals. Former US Open champion Kuznetsova will now be up against sixth seeded Belarussian Victoria Azarenka, who won a scrappy affair against Estonia's Kaia Kanepi 7-6, 6-3.
Twice Grand Slam winner Svetlana Kuznetsova and 14th seed Elena Vesnina posted hard-fought, straight-set wins in Friday's semi-finals to set up an all-Russian final in the BNP Paribas Open at Indian Wells.
Svetlana Kuznetsova reached the semi-finals of the Dubai Championships on Thursday after holding off a strong second set challenge to beat France's Amelie Mauresmo 6-1, 7-6.
Dinara Safina and Svetlana Kuznetsova muscled their way to straight-set wins on Saturday to set up an all-Russian final at the Pan Pacific Open.
Dinara Safina reached the French Open final with a 6-3, 6-2 win over fellow Russian and fourth seed Svetlana Kuznetsova on Thursday.
Elena Vesnina survived a battle of attrition and nerves to beat fellow Russian Svetlana Kuznetsova 6-7(6), 7-5, 6-4 in the BNP Paribas Open final on Sunday and secure the biggest title of her career.
Second-seeded Russian Svetlana Kuznetsova swept past Polish teenager Agnieszka Radwanska 6-2, 6-4 to reach the semi-finals at the Pacific Life Open on Wednesday. Kuznetsova, who was upset by Radwanska in the third round of the Australian Open in January, broke her 19-year-old opponent in the first and third games of the opening set on the Stadium Court.
Britain's Johanna Konta faces an anxious 24-hour wait before discovering whether she will make her debut at the WTA Finals in Singapore.
World No 2 Svetlana Kuznetsova was dumped out of the Australian Open by Poland's Agnieszka Radwanska, while sixth seed Anna Chakvetadze lost to compatriot Maria Kirilenko in the third round.
Svetlana Kuznetsova dug deep into her reserves to overcome Agnieszka Radwanska 7-5, 1-6, 7-5 in their WTA Finals round robin opener on Monday, the late-arriving Russian upsetting the defending champion in a thrilling encounter.
Fifth seed Svetlana Kuznetsova had an easy time against the 16-year-old Austrian in her fourth round match at Wimbledon.
Svetlana Kuznetsova beat Hungarian teenager Agnes Szavay 6-1 6-4 to reach the U.S. Open semi-finals on Wednesday and believes she is a better player than when she won the title in 2004.
Second seed Svetlana Kuznetsova beat Czech teenager Nicole Vaidisova 4-6 6-3 6-4 to move into the Pacific Life Open semi-finals on Thursday.
France's Marion Bartoli and Russia's Svetlana Kuznetsova suffered shock first-round exits from the Rogers Cup as the two seeded players were eliminated on Monday by a pair of gritty qualifiers.
The third seeded Russian rallied to beat the American to reach the semi-finals of the Warsaw Cup.
Sixth seeded Svetlana Kuznetsova was beaten by Serbian 19th seed Jelena Jankovic in the fourth round of the US Open.
Russian Svetlana Kuznetsova registered a 6-4, 6-0 victory to win the China Open title.
The defending women's champion was dumped out of the U.S. Open by fellow-Russian Ekaterina Bychkova.