Australian Open 2021: Serena Williams upsets No. 2 Simona Halep, sets up rematch with Naomi Osaka in semis | CBS Sports Headlines Australian Open 2021: Serena Williams upsets No. 2 Simona Halep, sets up rematch with Naomi Osaka in semis Williams has earned a trip to the Australian Open semifinals … Continue reading Australian Open 2021: Serena Williams upsets No. 2 Simona Halep, sets up rematch with Naomi Osaka in semis