Sandgren and Chung have played just once before.
Chung didn't care. He was relentless.
In a battle of unseeded players, Sandgren hit more aces and winners, but also committed more unforced errors, as Chung's relentless return game got him over the line. It's clear to say that the 21-year-old Chung has arrived and is ready for the big stage based on what he's done the last couple of weeks. "Those first weeks sometimes have become really tiresome".
"I think it's insane to assume that, to say, 'Well he's following X person so he believes all the things that this person believes.' I think that's ridiculous". I know that Novak maybe wasn't at 110% but he was all right. "He was the better player in the decisive moments". The former Vol defeated Marterer 5-7, 6-3, 7-5, 7 (7)-6 (5) in four sets. He had to earn his victory.
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"Congratulations. Amazing", said Djokovic, who also had an apparent hip or groin problem, screeching at times when stretching for the ball.
"It's not great. Unfortunately, it's not great", he explained.
Kerber said after winning the first set handily, she tried not to lose her focus.
"Woops", said Sandgren. "I was concerned about it. Let's see what's happening inside". Sandgren, however, didn't go down easily, as he created a chance for a break point from there. Chung connected on 47 winners to 37 unforced and was 6/10 on his break opportunities.
Chung, 21 conceded his semi-final against Switzerland's Roger Federer midway through the second set at Melbourne Park on Friday night
Finally playing in the main draw at Melbourne Park after repeated failed attempts to make it through qualifying, world number 97 Sandgren shocked Stan Wawrinka in round two and claimed another notable scalp on Monday.
Sandgren will take on Hyeon Chung in the quarter-finals on Wednesday.
Federer will renew a lengthy rivalry next against Tomas Berdych, who returned to the quarterfinals for the seventh time at Melbourne Park with a 6-1, 6-4, 6-4 win over Fabio Fognini.
Federer's record of not having dropped a set this tournament was threatened by Berdych, who opened up a 3-0 lead and served for the opening set.
"I think that was incorrect", he said.
"It's taken a lot of time going into it, but to get all your wins in one sitting is odd", Sandgren said after defeating Thiem which allowed him to move on to the second week of the tournament.
One point after his medical timeout in the fourth set, Rafael Nadal went to the rear of the court to squat and do a knee-raise, trying to stretch out his injured right leg. "It's just something that I thought wouldn't be a bad way to kind of move forward".
"Somebody who is running the tour should think [a] little bit about what's going on".
"I had a hard time breaking through until two sets to love and a break". I definitely understand that I have very few, if any actual answers. "That's a good thing".
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