Dominic Thiem has accused Serena Williams of having a "bad personality" as the bizarre row over him being booted out of his own press conference so that Roland Garros organizers could accommodate the American superstar instead took another twist.

Austria's Thiem, the fourth seed in the men's event and the 2018 runner-up, was conducting his post-match press obligations after reaching the last 16 late on Saturday.

However, he was then informed that the main interview room was needed by Williams who 

had just suffered a third-round loss to Sofia Kenin.

It was the 23-time Grand Slam title winner's earliest exit at a Slam in almost five years and she was eager to be away from the tournament site as quickly as possible.

"It is just the principle," Thiem told Eurosport German. "Even if a junior is in there, every player has to wait."

There was no indication as to who had decided to shift Thiem mid-flow on Saturday night.

"It's a joke," fumed the 25-year-old Thiem to media officers after being told he should finish his interviews in a smaller room. "I have to leave the room because she's coming. What the hell, I don't care. I can also do ­whatever I want."

Roger Federer, meanwhile, leapt to the defence of Thiem, describing him as "a superstar, a male superstar."

"I think the one who is still in the tournament gets priority, that's how I see it," said Federer after easing past Leonardo Mayer on Sunday to reach his 54th quarterfinal at the majors.

"There must have been a misunderstanding or maybe they should have kept Serena still in the locker room, not waiting here in the press center. 

"I don't know exactly what happened. I understand Dominic's frustration. I don't think he's mad at Serena or anybody. I just think it was an unfortunate situation."

Former German great Boris Becker also said Thiem was in the right to object to his eviction.

"If he is giving an interview, and his press ­conference isn't finished, then everybody else has to wait, including Serena Williams," Becker told Eurosport on Monday.

French sports daily L'Equipe claimed that Williams had shown no preference over where she carried out her press conference.

"Put me in another room, a smaller one, but now," she was reported to have said.

With Williams reportedly becoming increasingly impatient, officials looked to rescue the situation by moving Thiem to another room.

"That's really impolite," she was heard to say.