Day seven at the Australian Open served up a host of thrilling encounters.
Both Naomi Osaka and Serena Williams were forced to a third set to advance to the quarter finals, while Kiwi Marcus Daniell equalled a career-best result in Melbourne.
However, the biggest shock of the day came in form of Russian Aslan Karatsev who defied his world ranking of 114 to become the first male qualifier to make the Australian Open quarter finals since Croatia's Goran Ivanisevic achieved the rare feat in 1989.
8pm: World No. 3 embarrassed in major upset
In major upset, Austrian star Dominic Thiem has been knocked out by Grigor Dimitrov in straight sets on Rod Laver Arena.
Thiem was completely outclassed by his Bulgarian rival, going down 6-4 6-4 6-0 in Melbourne Park.
The 27-year-old won just six points in a horrifically one-sided third set.
Dimitrov will face Russian cult hero Aslan Karatsev in Tuesday's quarter final.
7pm: Kiwi advances to doubles quarters
New Zealand's Marcus Daniell has advanced to the quarter finals of a Grand Slam for just the second time after an impressive men's doubles victory on Sunday.
Daniell, whose previous best result at a Slam was also at the Australian Open in 2018, partnered with Austria's Philipp Oswald to defeat the US-pairing of Nicholas Monroe and Frances Tiafoe 6-3 7-5.
The pair will now face either the fifth-seeded pairing or the 10th-seeded pairing - of which fellow Kiwi Michael Venus is a part of - in the quarter finals.
Great result for @MarcusDaniell and his Austrian partner Philipp Oswald who have advanced to the @AusOpen doubles quarter finals in Melbourne with a 6-3 7-5 win over Americans Nicolas Monroe and Frances Tiafoe.
Aslan Karatsev has beaten Felix Auger-Aliassime to become the first man since 1996 to reach the quarterfinals on his Grand Slam debut.
The 27-year-old Russian qualifier dropped the first two sets but lifted his level and cut down his error-rate to beat the 20th-seeded Auger-Aliassime 3-6, 1-6, 6-3, 6-3, 6-4.
Karatsev became the first male qualifier to make the Australian Open quarter finals since Croatia's Goran Ivanisevic achieved the rare feat in 1989.
On top of that, not since Alex Radulescu at Wimbledon in 1996 has a player on debut reached the men's quarterfinals at a Slam. Plus he's the first qualifier since Bernard Tomic at Wimbledon in 2011 to reach the last eight at a major.
The No. 114-ranked Karatsev said it took him two sets "to find a way how" to break down Auger-Aliassime's game.
He'll play either US Open champion Dominic Thiem or Grigor Dimitrov next and he says he doesnt' have a preference.
Osaka had to come back from two match points down in the third set, before peeling off four straight games right at the moment she looked dead and buried.
Osaka left tennis commentators blown away with her game-management nous after she made a tactical retreat not to fight fire with fire.
With Muguruza spanking everything that came back over the net, Osaka pulled her own strokes in a bit to extend rallies before picking her moments to pull the trigger.
Naomi Osaka has gears. This is a mind-blowing injection of brilliance.
Osaka had to defend two match points when serving at 5-3 to stay in the match. Like she does so often, she found her mojo right when she was dipping her toes over the abyss of defeat.
She converted a break in the next service game and then ran away with the match from there with Muguruza's spirit clearly broken.
Osaka broke Muguruza to love to secure the 4-6 6-4 6-4 win. after almost two hours on court.
Osaka now faces Thailand's Su-Wei Hsieh in the quarter finals.
Japan's Naomi Osaka celebrates after defeating Spain's Garbine Muguruza. Photo / AP
Muguruza had been in freakish form this summer, having not dropped a set at the Aussie Open before she came up against Osaka. Muguruza also won every set she played at the Yarra Valley Classic before she met Ash Barty in the final.
Osaka is now the outright favourite to win the tournament.
Fake crowd noise at the Australian Open has been killed off after a handful of minutes during a strange start to Day 7.
Australian Open boss Craig Tiley said earlier on Sunday the event would explore fake crowd noise for both the live TV broadcast and inside the empty arenas. And the experiments were still ongoing when the action kicked off.
While gentle applause has been heard on Australian TV throughout Sunday, the sound-effects were killed off after just one service game inside Rod Laver Arena where the blockbuster Naomi Osaka-Garbine Muguruza match was being played, according to reports.
Radio commentator Shane McInnes posted on Twitter the "distracting" crowd noise was cut from inside the stadium after a "bizarre" seven minutes.
A couple of changes to the set up at Melbourne Park on second day without crowds at #AusOpen
🎾Banners covering seats
🎾Crowd noise being pumped through speakers on court, which then comes across on the broadcast.
No fake crowd noise effects were being used for the broadcast of the action on Margaret Court Arena, but the sound effects continued on Rod Laver Arena as Osaka and Muguruza went into a deciding third set.
12:30pm: Nick Kyrgios coded before walking onto court
Nick Kyrgios and Thanasi Kokkinakis were hit with a code violation before even getting up of their chairs for the start of their first round men's doubles match on Saturday.
Without warning, chair umpire Louise Azemar Engzell announced a time violation warning for the pair, leaving them both staring back with blank expressions on their faces.
Opposition pair Lloyd Harris and Julian Knowle had been standing on court in position to start the match while Kyrgios and Kokkinakis chatted away near their seats.
A stunned Kyrgios took a couple snippy swipes at the official after she failed to give them a hurry up first.
"We were waiting for you to say time," Kyrgios said.
"You can't just give us a warning? You can't just say, 'are you guys ready?'
The pair eventually cruised through to the second round and will face Wesley Koolhof and Lukasz Kubot.
Nick Kyrgios has had yet another run-in with an umpire. Photo / AP
Kyrgios was last week hit with a time violation warning when serving during a singles match during the Melbourne Summer series lead-up event.
Kyrgios blew up at the chair umpire during his second round match and at one point refused to keep playing after he was hit with a time wasting violation in the middle of a service game.
"I'm not playing. Get him (the supervisor) out. No, I don't understand. I wanna talk to him," he said.
"I'm not f***ing moving. It's like you guys do it to just be funny. Bro, I was serving. Why'd you have to call it?"
