It was Kristyna's first win over a top-five ranked player and she will go on to play fellow Czech Barbora Strycova in the quarter-finals.
A marvel on the tennis court, new mum Serena Williams is now sporting her own superhero outfit as she makes her return to Grand Slam tennis.
Former world number one Serena Williams returns to Grand Slam action for the first time in over 15 months, when she goes up against Czech Kristyna Pliskova in the French Open first round.
World number one Angelique Kerber got the birthday gift she wanted Wednesday by making the Australian Open third round, but she had to work hard against fellow German Carina Witthoeft.
Images from Day 5 of the French Open, at Roland Garros, in Paris.
Images from all the action on Day 5 of the Australian Open
Defending champions Leander Paes and Radek Stepanek had to work hard to cross the first round hurdle in the men's doubles even as Sania Mirza advanced in both the mixed and doubles events at the US Open.
Serena Williams faces her first seeded opponent at the French Open on Thursday and will hope to use her booming serve to beat Australian Ashleigh Barty in the second round.
Muguruza used her experience to get out of trouble, eventually set up a meeting with Ukrainian 10th seed Elina Svitolina in just over two hours under a relentless sun at Indian Wells.
Even the Parisian stormclouds cleared for Serena Williams on Tuesday, as the new mother's baby steps back to Grand Slam tennis became a stride into the second round of the French Open.
Rediff.com takes stock of the seeded casualties on the first day of the Australian Open.
World number one Rafael Nadal recorded his 20th straight win on clay as he began his quest for a sixth title in Madrid, defeating Frenchman Gael Monfils 6-3, 6-1.
Former world number one Maria Sharapova avenged her US Open loss to Anastasija Sevastova with a 7-6(3), 5-7, 7-6(7) victory over the Latvian in the China Open first round on Saturday.
'I took the wildcard for Eastbourne and it's great to be feeling the grass again, and I'm happy the clay court season is already finished.'
Halep finds groove to reach Prague semi-finals.
Former World No 1 Kim Clijsters says, "I admire both Serena and Venus because they have a perseverance that is incredible. They're able to do a lot of things that other people can't do, physically and mentally, so I don't doubt that she will come back, I don't doubt it, but it just takes a little bit of time."
Karolina Pliskova lost her cool over a line call and bashed a hole into the umpire's chair with her racket after suffering a 3-6, 6-3, 7-5 defeat by Maria Sakkari in the Italian Open second round on Wednesday.
Williams had little trouble against the 31-year-old German although the gusty breezes at Auckland Tennis Centre played havoc with her ball toss, especially when she was serving for the match at 5-3 in the second set.
A round-up of tennis matches played on Tuesday.
"I think she will win a Grand Slam. Which one and when I don't know, but definitely clay is a good surface for her."
American Jennifer Brady defeated compatriot Coco Gauff 6-2, 6-4 at the Top Seed Open on Saturday, earning a spot in her first WTA final.
Prajnesh, India's top-ranked singles player at 122, downed the local wild card Jason Kubler 7-5, 6-3 in the first round
Melbourne man McNamara won five singles titles and 19 in doubles and teamed up with compatriot Paul McNamee to win the Australian Open doubles in 1979 and Wimbledon twice in 1980 and 1982.
A summary of sports events and persons who made news on Sunday
World number one Rafael Nadal set a new record of winning 50 consecutive sets on a single surface by beating Argentine Diego Schwartzman 6-3, 6-4 on Thursday to reach the Madrid Open quarter-finals.
American qualifier Sachia Vickery completed an astonishing comeback to stun third seed Garbine Muguruza 2-6, 7-5, 6-1 in a second-round win at the BNP Paribas Open in California on Friday.
Images from all the action on Day 3 at the Australian Open in Melbourne on Wednesday
Milos Raonic overcame third seed Grigor Dimitrov 7-5, 3-6, 6-3 to reach the third round at the Madrid Open on Tuesday and set up an all-Canadian clash with teenager Denis Shapovalov.
Angelique Kerber's first Grand Slam match since winning the Australian Open in January ended in despair after she was beaten 6-2, 3-6, 6-3 by Kiki Bertens of the Netherlands in the French Open first round in Paris, on Tuesday.
The women's draw at the US Open has been in news for the upsets it created. Almost everyday one or some days even two of the top seeds feel to unknown players.
A summary of Thursday's play at the US Open.
Former World No 1 Ana Ivanovic was upset 7-5, 6-4 by 42nd-ranked Karolina Pliskova of the Czech Republic in the second round of the US Open on Thursday.
A summary of Day 2 at Wimbledon on Tuesday.
Former world number one Andy Murray withdrew from the Brisbane International with a hip problem on Tuesday, further putting in doubt the Briton's prospects of being fit in time for the Australian Open later this month.