Tennis umpire Carlos Ramos has lifted the lid on Serena Williams post-match accusation of sexism.

Williams was facing Japanese international Naomi Osaka in the final of the US Open on Saturday, as the American was chasing a record-breaking 24th Grand Slam title.

However, the world number one Williams received three code violations, therefore, meaning she was docked a game.

Firstly Williams was warned after her coach Patrick Mouratoglou was caught gesturing to communicate with her, and then the American was docked a point after smashing her racket.

Things got even worse for Williams as she was punished for a third time after she branded Ramos a ‘thief’ and a ‘liar’ in a lengthy heated exchange with the umpire.

At the post-match press-conference, Williams took aim at Ramos and suggested male players would not have been punished in the same way she was during her final.

"I'm here fighting for women's rights and for women's equality and for all kinds of stuff. For me to say 'thief' and for him to take a game, it made me feel like it was a sexist remark," she said.

"He's never taken a game from a man because they said 'thief.' For me it blows my mind. But I'm going to continue to fight for women.”

Ramos, however, has spoken out about the incident for the first time in an interview with Tribuna Expresso in his native country, as the Spaniard cited he was content with the decisions he made as he does not pick and choose when to apply the rule book.

“I’m fine, given the circumstances,” he said. “It’s a delicate situation, but a la carte arbitration does not exist. Do not worry about me.”

Remarkably, Ramos will make a swift return to the umpire chair as he will officiate the Davis Cup clash between the US and Croatia in what can be considered a questionable appointment given the various criticism the Portuguese has received over the last few days.