The Australian Open final is the 53rd between Novak Djokovic and Rafael Nadal, the most between two men in the professional era -- with Djokovic leading 27-25.
The victory allows the 21-year-old Osaka to become the first tennis player from Japan to reach No. 1 in the rankings.
In 2012, Djokovic edged Nadal 5-7, 6-4, 6-2, 6-7 (5), 7-5 across 5 hours, 53 minutes, making it the lengthiest Grand Slam title match in history.
The victory Friday was the 10th in a row for Stosur and China's Zhang.
On Sunday, the 32-year-old Spaniard will try to earn his second Australian Open title — he won the hard-court event in 2009.
Tsitsipas' run to the first major semifinal of his nascent career was most notable for the way he beat 20-time major champion Federer in the fourth round, saving 12 of 12 break points across four sets.
Petra Kvitova defeated Danielle Collins 7-6 (2), 6-0 while Naomi Osaka downed Karolina Pliskova 6-2, 4-6, 6-4 in the semi-finals to set up a summit clash against each other.
The 24-year-old Frenchman will next play Novak Djokovic, who is aiming for a men's record seventh Australian title.
Serena Williams has lost her Australian Open quarterfinal to Karolina Pliskova after being called for a foot-fault on match point.
Nadal reached his 30th major semifinal and prevented Tiafoe from getting to his first, two days after he turned 21.
The unseeded pair of Paes and Stosur won the first set 6-4 against Anna-Lena Groenefeld and Robert Farah but conceded the second set with the same scoreline.
Djokovic has won six of his 14 Grand Slam titles at Melbourne Park and is into his 10th quarterfinal at the hard-court tournament.
Kei Nishikori came back from two sets down to beat No. 23-seeded Pablo Carreno Busta 6-7, 4-6, 7-6, 6-4, 7-6 and reach the quarter-finals of the Australian Open.
Serena Williams defeated Simona Halep 6-1, 4-6, 6-4 in round four of the Australian Open.
A little more than two years after switching back from bat to racket, Barty has caught the attention of a nation.
Zverev extended an unwanted streak of never beating a top 20 player at a Grand Slam tournament.
She joins Mary Pierce and Yevgeny Kafelnikov in the Class of 2019, which was announced Monday at the Australian Open.
Serena Williams had recently called for equal prize money for men and women players all year round and not just in the Grand Slams, as is the current norm.
Stefanos Tsitsipas, 20, idolises Roger Federer, who at 37, was the oldest man left in the field and was bidding to become the oldest man to reach the quarterfinals in Australia since 1977.
14th seed Stefanos Tsitsipas defeated 3rd seed Roger Federer 6-7 7-6 7-5 7-5 in fourth round to knock the Swiss out of Australian Open.
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