NEW YORK—Stefanos Tsitsipas delivered sound and fury in his opening-round US Open loss to Andrey Rublev.

Much of Tsitsipas' wrath was directed at chair umpire Damien Dumusois.

More: Rublev The Giant Killer

The eighth-seeded Greek blasted the veteran chair umpire as "a weirdo", baited Dumusois into hitting him with a time violation warning and afterward charged the chair "has something against me."

It all went down during Rublev's 6-4, 6-7, 7-6, 7-5 victory on Louis Armstrong Stadium.

While Rublev waited at the baseline for play to resume, Tsitsipas, who appeared to battle groin and cramping issues, took his time putting on his lime green sweatbands and headband. When Dumusois informed Tsitsipas he was running out of time, Tsitsipas lowered the verbal boom.

"You’re a weirdo!" Tsitsipas said. "I don’t care give me a warning. Give me a warning. I don’t care."

Dumusois complied and hit the Greek with a time violation warning. Affterward, Tsitsipas claimed the French chair umpire has an issue with him and his team.

"The chair umpire was very incorrect in what he was telling me during the match," Tsitsipas said. "I don't know what this chair umpire has in specific against my team but he's been complaining and telling me that my team talks all of the time when I'm out on the court playing. 

"I believe he's not right, because I never hear anything of what my team says from the outside. And there is nothing that I personally believe can help my game or make me play better. My father outside, who usually does the talking, he's trying to pump me up by saying, you know, Come on. Raising my confidence by not coaching but by trying to boost me up. I believe the coach for my opponent does the same thing, which is normal. This chair umpire, I don't know, he has something against me. I don't know why."

The 21-year-old Greek suffered his third straight opening-round loss and fourth in his last five events, including a first-round Wimbledon loss to Thomas Fabbiano.

"First-round, second-round losses are unacceptable anymore," Tsitsipas said. "Obviously you're going to drop in the rankings and then it becomes more professional in a way where you have to be, you know, you have to be playing well in all those tournaments and events.

"I don't know where my ranking is going to be now. It has dropped pretty fast after that No. 5 career high. I mean, I obviously want to get back there, and it feels great."

This isn't the first time Tsitsipas has questioned a chair umpire's integrity. After the Miami Open in March, the Australian Open semifinalist said some chair umpires show preferential treatment to established stars.