Russian tennis star Andrey Rublev sounds off on US Open fine for profanity during match

But in the heat of competition, Rublev doesn't feel he should be docked thousands because of his words. 

Rublev added that "in all of sports" it is a normal occurrence for expletives to be said, especially "in the crucial moments."

"It's sports. It's life," he continued. "The same with every person outside in life in crucial moments, in stressful moments. I don't believe all of us are super holy and never say bad words in the crucial moments. It's the same thing… like I said if you're doing it towards someone or you're doing it too much openly, yes, but with yourself, it's your decision how you talk."

Rublev isn't the only Russian who was fined this year at the U.S. Open. Daniil Medvedev's widely publicized rant in his first-round upset to Benjamin Bonzi resulted in a $42,500 fine. 

Rublev, the godfather of Medvedev's children, offered support to his compatriot after that incident made headlines. 

"If he wants to change and needs help he has me, a lot of other friends and family that will help him," Rublev said. 

Rublev was able to take down Coleman Wong in a thrilling five-set third-round match on Saturday. Rublev lost the first set, 6-2, before taking the next two, 6-4, 6-3. Wong came back with a fourth-set victory, 6-4, before Rublev took the fifth set, 6-3, to move on in the tournament. 

Rublev will take on Canada's Felix Auger-Aliassime, the 25th-ranked men's singles player, in the Round of 16 on Monday.