"Who you follow on Twitter I feel doesn't matter even a little bit. What information you see doesn't dictate what you think or believe. I think it's crazy 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.
"That's not how information works. If you watch a news channel, you wouldn't then say that person who is watching the news channel thinks everything that news channel puts out."
Before arriving in Melbourne, Sandgren – who is 26, and ranked No. 97 – had played only two grand-slam matches and lost them both. But he scored a superb 6-2, 4-6, 7-6, 6-7, 6-3 win over fifth seed Dominic Thiem on Monday, and thus became arguably the most unlikely quarter-finalist at a major since Martin Verkerk at the 2003 French Open.
"I definitely had a real pinch-me moment," said Sandgren. "Wow, this is hopefully real. If I wake up now, I'm going to be real upset."