Daniil Medvedev fired Russia into the final of the ATP Cup on Saturday with a tense 3-6, 6-3, 7-5 win over an injury-hampered Alexander Zverev after the German destroyed a racket in frustration over a lost service break.
Former world number one Venus Williams produced a vintage display to outclass Netherlands' Arantxa Rus in straight sets and storm into the second round of the Yarra Valley Classic.
While she was keen not to take anything away from an impressive performance by Muguruza in Friday's match, Kenin said she had been hampered by a groin problem.
Serena Williams showed glimpses of what lies in store for rivals this season
Garbine Muguruza was relieved to finally avoid tripping at the last hurdle and end her trophy drought
Naomi Osaka settled her nerves and stepped up her preparations for the Australian Open by beating Alize Cornet 6-2, 6-2 to reach the last 16 of the Gippsland Trophy warm-up tournament in Melbourne on Tuesday.
It has been 24 days since Victoria reported a locally acquired COVID-19 infection, while Australia as a whole posted a 13th straight day without a community case on Saturday.
Serena Williams sounded a warning for her fellow Australian Open contenders with a sleek win
Images from Day 4 of the Australian Open in Melbourne on Thursday.