Naomi Osaka and Petra Kvitova battled into the last four of the Stuttgart Open on Friday, with the world number one bemused by criticism.
Ashleigh Barty and Samantha Stosur saw Australia through to a first Fed Cup final in 26 years after a thrilling doubles win over Belarus.
Aryna Sabalenka and Ashleigh Barty will meet in a potentially pivotal showdown on Sunday after winning their opening matches.
Garbine Muguruza was leading 6-1 3-1 when Victoria Azarenka retired due to a leg injury in Sunday's Monterrey decider.
Not since March 2016 had Victoria Azarenka featured in a singles final but the fifth seed will end that drought thanks to Saturday's win.
Angelique Kerber and Garbine Muguruza reached the Monterrey Open quarter-finals.
A two-time runner-up in Monterrey, top seed Angelique Kerber moved into the second round.
A three-time Miami Open champion, Victoria Azarenka lost to French 19th seed Caroline Garcia in straight sets on Thursday.
Rain wreaked havoc again but before it did, former world number one Victoria Azarenka made it past the first round midweek.
Rain wreaked havoc in Miami, where the WTA schedule was washed out on Tuesday.