Former world No 1 Garbine Muguruza sounded out a warning to her Australian Open rivals with a 6-1, 6-0 thrashing of Marketa Vondrousova on Saturday to set up a Yarra Valley Open final against Ash Barty. Australian Barty, who currently tops the world rankings, got her place in Sunday's final of the warm-up tournament when Serena Williams pulled out of their semi-final on Friday. The warm-up tournaments at Melbourne Park were hit by more withdrawals early on Saturday when former Australian Open champions Naomi Osaka and Victoria Azarenka pulled out, citing injuries. The withdrawals all had the look of precautionary measures and it was a case of feast to famine for organisers, who had put on some 70 matches on Friday after play was postponed a day earlier because of a Covid-19 scare. Muguruza looked in rude health in backing up Friday's 6-2, 6-2 win over Sofia Kenin, which had given her a measure of revenge for her loss to the American in last year's Australian Open final. The former French Open and Wimbledon champion took less than an hour to blow Czech Vondrousova off the court at the Margaret Court Arena and has reached the final with the loss of only 10 games in four matches. "I think I played well today, my serve was working well at the right moments and I was able to control the match," said Muguruza, who is seeded 14th for the Grand Slam and faces lucky loser Margarita Gasparyan in the opening round. "I'm expecting another battle tomorrow." Osaka's withdrawal gave Belgian Elise Mertens a walkover to the final of the Gippsland Trophy against Kaia Kanepi, who beat ninth seed Ekaterina Alexandrova 6-3, 7-6 on Saturday. US Open champion Osaka said she was struggling with a long-term shoulder "niggle". "It kind of flared up again because I played a lot of matches back-to-back," the 23-year-old said. "But for me, my main focus is hoping I can rest enough before the Open." Azarenka withdrew from her Grampians Trophy quarter-final against Anett Kontaveit, giving the Estonian a walkover. The WTA said the Belarusian had a lower back problem. Kontaveit will play Maria Sakkari in the semi-finals after the Greek ousted 2016 Australian Open champion Angelique Kerber 6-4, 6-2. Jennifer Brady will play fellow American Ann Li or Romanian Sorana Cirstea in the other semi-final on Sunday after a 7-6, 6-4 quarter-final win over Barbora Krejcikova.
