He added: “People can screenshot, save and distribute everything they would like to. I know that, and that’s fine. It is what it is. It’s just something that I thought wouldn’t be a bad way to kind of move forward.”

Before his social media posts disappeared, dozens of other Twitter users and publications had preserved them.

On Jan. 14, Sandgren retweeted a video on Twitter posted by Nicholas Fuentes, a young alt-right commentator and a former host of a podcast called “America First.” (Fuentes retweeted support for Sandgren on Monday.) And in November 2016, shortly after the presidential election, Sandgren seemed to support debunked online reports of children being kidnapped, molested and trafficked in a Washington pizzeria as part of a sex-abuse ring connected to Hillary Clinton.

“It’s sickening and the collective evidence is too much to ignore,” Sandgren posted in a Twitter conversation on the topic that was labeled Pizzagate by proponents and critics alike.

At Monday night’s postmatch news conference, Sandgren’s coach, Jim Madrigal, tried to shut down the inquiry about Sandgren’s political views by saying, “This is the Australian Open.” But Sandgren chose to answer and said he did not support the so-called alt-right movement.

“I don’t,” he said. “I find some of the content interesting.”

At the time, he did not elaborate on what he found interesting. In his ESPN interview Tuesday, he clarified that he did not think alt-right content was interesting, “just some individuals’ specific content.”

In an interview with The New York Times on Monday night, Sandgren shook his head when asked if he believed in the Pizzagate conspiracy.