Stefanos Tsitsipas managed to stun defending champion Roger Federer in 4 sets. There were no end of upsets today and Federer was the latest casualty. Federer clinched the opening set in a tie break before Tsitsipas came to life and took the next three.
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Here is how Twitter reacted to the shock defeat.
He's done it! @StefTsitsipas knocks out defending champion Roger Federer 6-7(11) 7-6(3) 7-5 7-6(5) to reach his first quarterfinal at a Grand Slam. #AusOpen #AOFiredUp
What an effort! Please don't forget us @rogerfederer! 😊 #AusOpen
Roger Federer is OUT of the Australian Open. 20-year-old Stefanos Tsitsipas is in the quarter-finals. REACTION 👉 bbc.in/2RXX6yN #bbctennis #AusOpen
HE"S DONE IT!!! Stefanos #Tsitsipas beats Roger #Federer 6-7 7-6 7-5 7-6 to move into the quarter finals of the #AusOpen! He was sensational! A STAR INDEED IS BORN!!!
Roger Federer is out of the Australian Open. It's the biggest win of his career for the Greek 14th seed Stefanos Tsitsipas. Read all about it 👉 bbc.in/2HnCbB5
A stunner Down Under 😮 20 y/o @StefTsitsipas knocks out defending champion Roger Federer 6-7 7-6 7-5 7-6 for the biggest win of his young career 👏 #AusOpen
"I'm the happiest man on earth right now." 🇬🇷👏 @StefTsitsipas scores a sensational 6-7(11), 7-6(3), 7-5, 7-6(5) win over Roger Federer in R4 of the #AusOpen! Say 👋 to your first Grand Slam QF, Stefanos... 📸: #USOpen
BREAKING: Defending champion @rogerfederer is out of the @AustralianOpen after being beaten 6-7 7-6 7-5 7-6 by 20-year-old @StefTsitsipas. #SSN
.@StefTsitsipas has been idolising Roger Federer since the age of six. At 20-years-old, he's speechless 😶 #AusOpen