Ashleigh Barty leads Australia's hopes of reaching a first Fed Cup final since 1993 when they face 2017 runners up Belarus in Brisbane.
Ashleigh Barty will rise from 11th to number nine in the world rankings and become the first Australian woman since Sam Stosur in June 2013 to crack the top 10.
Roger Federer booked a Miami Open semi-final against Denis Shapovalov with a ruthless 6-0, 6-4 destruction of Kevin Anderson.
It completed another bad day for organisers who lost their main attraction on the eve of the tournament, Naomi Osaka.
Umpire Alison Hughes was lucky to escape injury as the spider-cam ripped the sun shield right off her chair.
Australian Open 2019: Ashleigh Barty stunned five-time Grand Slam winner Maria Sharapova in a three-set thriller.
Serena Williams, seeking a 24th Grand Slam title, will face Germany's Julia Goerges for a place in the French Open last 16.
Ashleigh Barty was scheduled to play third seed Maria Sharapova in the second round on Wednesday.
The first all-Czech duo to win the US Open crown took home $460,000. They also won the 2011 French Open title.
Hsieh became the first player from Taiwan to win a Grand Slam title while Peng gave China its first doubles title at a major in seven years.
On her Roland Garros debut last year, likewise as a wildcard entrant, she lost in the opening round to eventual semi-finalist Petra Kvitova but on this occasion her Czech contest had a happy ending against a player better known for her doubles abilities -- Hradecka winning the pairs title in Paris in 2011.
The injury-plagued German was forced to retire from her opening singles match at the mixed teams tournament on Saturday due to a right knee problem.