The 26-year-old, a devout Christian, came under scrutiny this week during his run to the Australian Open quarter-finals over his apparent support on Twitter for far-right groups in the United States.
He refused to take any questions on his past Twitter writings, but has been under increasing pressure to address them following criticism from the likes of Serena Williams.
Sandgren chose to address a 2012 tweet in which he wrote: "Stumbled into a Gay Club last night ... my eyes are still bleeding."
"In regards to the Gay Club Tweet from 2012, I used poor and harsh words to describe a bad experience, and is not indicative of how I feel about the people in that community," he said late on Thursday.
Among his other now wiped tweets was one where he appeared to back a debunked online conspiracy in 2016 which linked Hillary Clinton to a supposed child sex abuse ring at a Washington pizzeria.
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