It appears that US Open final umpire, Carlos Ramos, is no stranger to a tad of controversy regarding the Williams' sisters. During Saturday's Grand Slam final against Naomi Osaka, Serena was slapped with three separate violations. The first being a coaching violation, the second being racket abuse and the third for calling Ramos a 'thief'. As a result, Osaka was awarded a game. A decision Williams was outraged by and proceeded to content with an emotional and controversial outburst. “I’ve seen other men call other umpires several things,” she said.“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. He’s never taken a game from a man because they said ‘thief’.“I just feel like the fact that I have to go through this is just an example for the next person that has emotions, and that want to express themselves, and want to be a strong woman. They’re going to be allowed to do that because of today,” Williams stated.“Maybe it didn’t work out for me, but it’s going to work out for the next person.”“For me, it blows my mind. But I’m going to continue to fight for women.”Since the incident, tennis fans have pointed out that Serena's sister, Venus, received similar treatment from Carlos Ramos during the French Open in 2016.Similarly, Venus was understandably upset for being penalised and denied that she had received coaching.She didn't quite protest to the same extent as her younger sister, however.

"I'm not even looking at my boss," Venus pleaded.

"I'm 36-years-old, never in my career have I had a coaching violation, no I don't do that!"

Furthermore, other tennis stars such as Billie Jean King and Victoria Azarenka have come out to support Serena, who went on to lose the final in straight sets.

Azarenka, former US Open champion, tweeted: "If it was a men's match, this wouldn't happen like this. It just wouldn't."