Australian pair of Olivia Gadecki and John Peers became the first duo in 37 years to defend Australian Open mixed doubles crown on Friday.
Olivia Gadecki and John Peers battled back from a set down to defeat compatriots Kimberly Birrell and John-Patrick Smith
Struggling Swiatek will open her campaign against Slovakian Rebecca Sramkova.
Veteran Indian tennis star Rohan Bopanna and his Chinese partner Zhang Shuai entered the quarter-finals in the mixed doubles at the Australian Open after receiving a walkover in a second round match in Melbourne on Sunday.
Coco Gauff forgot to bring her rackets to the court but reminded her rivals of her French Open title ambitions with a commanding win while Daniil Medvedev lost his composure on a cold and blustery Tuesday as he crashed out in the opening round.
Sierra, who had already checked out of her accommodation, learned only at lunchtime on Monday that Belgium's Greet Minnen had pulled out of the tournament and that she had been selected in the draw for a lucky loser spot in the main draw.
Rohan Bopanna and Shuai Zhang suffered a narrow defeat against local wild cards John Peers and Olivia Gadecki in a thrilling contest at the Australian Open on Tuesday.
Colombia's Camila Osorio pulled out a 7-6 (5), 6-7 (2), 7-5 win over Russia's Veronika Kudermetova, and Italy's Martina Trevisan beat Mexico's Renata Zarazua 6-4, 6-3.
While Sinner is into his fifth Grand Slam semi-final, Shelton, who turned pro in 2022, is set to play just his second after reaching the last four at the 2023 US Open.
Australian Open winner Madison Keys became the latest seed to tumble out of Wimbledon 2025.
At 27, the second seed is still seeking his first Grand Slam title and hopes to become the first German man to win the Australian Open since Boris Becker in 1996.
"We're so excited for our new adventure," added Barty, who will be at the January 16-29 Australian Open mentoring local hope Olivia Gadecki.
"The best part is she just treats me like a normal person and we can relate in that regard and off-court is just as important as on court."
India's Divij Sharan and Ankita Raina crashed out of the Australian Open men's and women's doubles events respectively, after suffering straight set defeats in the opening round in Melbourne on Thursday.
Indian tennis ace Sania Mirza and her Swiss partner Martina Hingis continued to display their rampaging form as they extended their winning streak to 32 after progressing through to the third round of the Australian Open in the women's doubles event on Saturday.
Murray to practise with Djokovic in Rome before return from injury.
Ankita Raina realised a long-time dream when she signed up with Romania's Mihaela Buzarnecu and earned a direct entry.