Ashleigh Barty and Samantha Stosur saw Australia through to a first Fed Cup final in 26 years after a thrilling doubles win over Belarus.
Rafael Nadal admitted everything went wrong in his defeat to Fabio Fognini in Monte Carlo, ending his hopes of a 12th title.
Romania and France are level at 1-1 in their Fed Cup semi-final after wins for Simona Halep and Caroline Garcia in Rouen on Saturday.
Rafael Nadal suffered his first loss in Monte Carlo since 2015, going down in straight sets to an in-form Fabio Fognini on Saturday.
Daniil Medvedev beat Novak Djokovic on Friday but succumbed to a straight-sets defeat against Dusan Lajovic in the semi-finals.
Aryna Sabalenka and Ashleigh Barty will meet in a potentially pivotal showdown on Sunday after winning their opening matches.
Despite a dip in form, Novak Djokovic remains confident he can get back to his best ahead of the French Open.
Daniil Medvedev caused an upset in Monte Carlo by beating Novak Djokovic, who will still remain top of the world rankings.
Despite a sluggish start, Rafael Nadal eventually progressed to the semi-finals of the Monte Carlo Masters at the expense of Guido Pella.
Novak Djokovic failed to make it past the quarter-finals in Monte Carlo as he suffered a shock loss to Daniil Medvedev.
Roger Federer's mark of 18 wins on the ATP Tour this season was equalled by Daniil Medvedev at the Monte Carlo Masters on Monday.
Rafael Nadal is bidding for a record 12th title in Monte Carlo and Novak Djokovic admits the Spaniard is always the favourite on clay.
World number two Rafael Nadal may take some stopping as he chases a 12th Monte Carlo Masters title, having thrashed Roberto Bautista Agut.
Former world number one Maria Sharapova is a three-time Stuttgart Open winner but she is not fit enough to fight for the title next week.
Tiger Woods' Masters triumph provoked an emotional response from Rafael Nadal, who himself battled back from injury to prosper once more.
Marin Cilic and Karen Khachanov crashed out of the Monte Carlo Masters, while Jo-Wilfried Tsonga was forced to retire due to injury.
Sascha Bajin, the WTA's Coach of the Year for 2018 following his work with Naomi Osaka, has been hired by Kristina Mladenovic.