DONALD Trump supporter Tennys Sandgren appears to have deleted tweets dating back to 2016 after his political views were put under the microscope following his unlikely charge into the Australian Open quarter-finals.

After downing No.5 seed Dominic Thiem on Monday to move into the last eight at Melbourne Park, the 26-year-old Sandgren was grilled on his seeming support for the alt-right movement in the United States.

Sandgren said he found some of the online content “interesting” but that he did not support the movement.

Pressed on the issue, he denied it was of importance.

“Look, who you follow on Twitter I feel like doesn’t matter even a little bit,” he said in a press conference.

“What information you see doesn’t dictate what you think or believe. I think it’s crazy to think that. I think it’s crazy to assume that, to say, ‘Oh well he’s following X person so he believes all the things that this person believes.’ I think that’s ridiculous.”

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Sandgren also told the New York Times he would not censor himself however it appears the controversy may have convinced Sandgren to rethink his strategy.

Social media users noted that up to 19 months of tweets had been removed, though Sandgren himself has not confirmed he was the one who did the deleting.

The unheralded American has been a revelation at Melbourne Park, upsetting former champion Stan Wawrinka in round two before sending Dominic Thiem packing.

He revealed his best ever Grand Slam run was all too much for his mum Lia, who cracked a rib as she jumped up and down in excitement back home in Tennessee, crashing onto a pool table.

“She didn’t have a concussion, thankfully. Maybe a tiny one,” said the 26-year-old, who cut off his ponytail and shaved his handlebar moustache for a new-look at the opening Grand Slam of the year.

He explained that he has a core supporter group back in Gallatin who get together to watch his bigger games, including his mum.

“They’ll go in the basement, put the match on the projector screen on the bottom. There’s a pool table down there, as well,” he said.

“They were jumping up and down, celebrating. She fell onto the pool table, cracked a rib. Whoops.

“I was pretty worried,” he admitted. “She was describing her pain level. She’s a tough woman. I was like, ‘You need to go to the hospital’.

“I was concerned about it. She went to the hospital.”

Sandgren, only the second man in the last 20 years to make the quarter-finals on his Australian Open debut, plays Korean giant-killer Chung Hyeon on Wednesday for a place in the semis.