Congrats Hyeon Chung! What a performance. Keep going!

— richardcjy (@richardcjy) January 20, 2018

Hyeon Chung bout to blow up 🇰🇷🇰🇷🇰🇷

— Steven Kim (@stevenyk) January 20, 2018

Sascha may be ranked higher, but prior to this match, Hyeon was already leading their H2H 1-0. Now, it's 2-0. Hyeon Chung is a talented player. He deserved this win. He did not get lucky. He knows how to beat Sascha. It's not really an upset, if you look at history, not rankings.

— Big Fat Tennis Fan (@BigFatTennisFan) January 20, 2018

Making history.

Hyeon Chung becomes just the third Korean player to make the R16 at a Grand Slam, ousting No.4… https://t.co/EmMUB0hFxE

— Gsb Zambia (@gsb_zambia) January 20, 2018

So impressed with Hyeon Chung! He retrieved shots that seemed impossible and turned them around to win the points! Amazing! #ausopen

— storme (@stormelaw) January 20, 2018

im so proud of hyeon chung!

— Sam 🗼🏆🥇 (@top__tennis) January 20, 2018

Korea's Hyeon Chung backs up his Milan Next Gen title by ousting #4 Sascha Zverev 5-7, 7-6(3), 2-6, 6-3, 6-0 to reach #AusOpen fourth round.

Zverev falls to 6-12 in his career in matches that go beyond a third set.

— Ben Rothenberg (@BenRothenberg) January 20, 2018

Remember this name because it won't be the last time you hear it!

Hyeon Chung scores his first 🔝 🔟 win by rallying to defeat No. 4 seed Zverev 5-7, 7-6, 2-6, 6-3, 6-0 in R3 of the AO!https://t.co/cD3XP4Jh3w #USOpen pic.twitter.com/GgHiL3SqUM

— US Open Tennis (@usopen) January 20, 2018

Kind of a crazy stat: Alexander Zverev became only the sixth top-five seed in the Open era to get bageled in the fifth set of ANY major, when he was knocked out by Hyeon Chung on Saturday.
https://t.co/CHIOScQqqq

— Matt Wilansky (@mattwilansky) January 20, 2018

Wow Hyeon Chung beat Sascha Zverev! 👏🏻👏🏻👏🏻

— 𝚗𝚒𝚌𝚔 (@NoleLondon) January 20, 2018

My Aussie Open dream is that one day Hyeon Chung will be presented with the trophy by the man from Kia Motors. Massive win for the talented Korean over No. 4 seed Zverev.

— Mike Dickson (@Mike_Dickson_DM) January 20, 2018

That is Hyeon Chung's first five sets win.

Also, players he's bageled on the tour:

A. Zverev
M. Zverev
Nishikori
Nagy
Melzer
Estrella Burgos
Go Soeda
Bedene
Wu
Granollers

Respect for the kid.

— José Morais (@ZezeAM) January 20, 2018

Hyeon Chung is absolutely on fire. His career trajectory has not been as steep as Zverev's over the last few years but man he's making a huge statement today.

— Chris Oddo (@TheFanChild) January 20, 2018

'Hyeon Chung – a rare example of a South Korean who prefers real sport to eSport'…. ah, trust the telegraph to be randomly racist while also printing his name backwards 🙃 https://t.co/vl572d9zYa

— el 🎄🎁🎀 (@tenetztowinne) January 7, 2018

Hyeon Chung, take a bow. Legend in the making. #Chung #Zverev needs to go home and contemplate why he automatically feels he deserves success when the others work just as hard and are much more humble and appreciative of what they achieve #AusOpen #AustralianOpen

— Dominic J Stevenson (@ipoeticus) January 20, 2018

Yesterday, along with Radu Albot ousted men's doubles defending Champions Kontinen/Peers. Today beat #4 Sascha Zverev in singles 5-7 7-6(3) 2-6 6-3 6-0

Hyeon Chung 🇰🇷🎉👏👏👏 #AusOpen pic.twitter.com/9fzXulKp1W

— Rika (@sushimaccheese) January 20, 2018

🇩🇪 Alex Zverev has lost 13 points IN A ROW to 🇰🇷 Hyeon Chung… & he has a suitably 😡 reaction to match.#7Tennis #AusOpen pic.twitter.com/IDymhq1Bm7

— 7SportAU (@7SportAU) January 20, 2018

Hyeon Chung beats Sascha Zverev in 5 sets. Who cares when the german got more potential when he always snaps in important moments? Sympathy is also not his passion. #ausopen

— empinism💢 (@mykesma) January 20, 2018