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From next season, seven of the nine ATP Masters 1000 events will be held across 12 days.
Swiatek showcased her all-court game in a straightforward 6-4 6-1 win over Russian Liudmila Samsonova to open the evening session.
The Spaniard won 6-7(1) 6-3 6-4 6-4 against the lanky Russian.
Jasmine Paolini blazed past American Emma Navarro 6-2 6-1 to become the first Italian woman to make the Wimbledon semifinals.
Second seed Coco Gauff was also not at her best but reined in the errors to get past Romanian qualifier Anca Todoni 6-2 6-1.
Alcaraz became the first man to defend a championship in the California desert since Novak Djokovic won three straight between 2014 and 2016.
Alcaraz came from behind to beat Jannik Sinner before Medvedev edged out American Tommy Paul 1-6, 7-6(3), 6-2 in the second semifinal.
The 22-year-old fourth seed is the first Italian to win the Melbourne Park title.
Alcaraz will face Green Group runner-up Novak Djokovic in a mouth-watering semifinal.
The 20-year-old Alcaraz will need to beat Medvedev in his final group game on Friday.
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