(AP Photo/Hamish Blair)MELBOURNE – The Latest from the Australian Open (all times local):12:45 a.m.Australian Open organizers say the player from Greece’s ATP Cup team who tested positive for COVID-19 on arrival in South Africa had returned a negative result the day he left Melbourne. Michail Pervolarakis played in the Greek team with Stefanos Tsitsipas last week in one of the six tuneup tournaments for the Australian Open. The Australian Broadcasting Corp. reported that Tennis Australia confirmed Pervolarakis tested negative for the coronavirus on Feb. 9. He reached the fourth round at Melbourne Park for the 14th time in 16 trips. The top-seeded Australian beat Ekaterina Alexandrova of Russia 6-2, 6-4 to reach the fourth round of the Australian Open for the third straight year.

United States' Serena Williams makes a forehand return to compatriot Danielle Collins during a tuneup event ahead of the Australian Open tennis championships in Melbourne, Australia, Friday, Feb. 5, 2021. (AP Photo/Andy Brownbill)MELBOURNE – Serena Williams withdrew from an Australian Open tuneup tournament citing a right shoulder injury on Friday within hours of setting up a semifinal match against top-ranked Ash Barty. Garbine Muguruza beat defending Australian Open champion Sofia Kenin 6-2, 6-2 to advance to the semifinals, reversing their result of their 2020 final at Melbourne Park. On either side of a delay on outside courts because of rain, former Wimbledon, U.S. Open and Australian champion Angelique Kerber beat No. 4 Borna Coric out in the quarterfinals after wins over Australian players earlier in the day.