Iga Swiatek has reached the last four of the Madrid Open coming from behind against Beatriz Haddad Maia but Ons Jabeur collapsed to Madison Keys.
Carlos Alcaraz and Jannik Sinner have come from a set down to progress to the last eight of the Madrid Open but Alexander Zverev has been knocked out.
The formidable teams of the United States and Canada are likely to bar Australia's way to repeating their 2022 run to the Billie Jean King Cup final.