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Featured Image Credit: ABC
The movie is based on the early years of tennis superstars Serena and Venus Williams and their father, Richard.
Beyoncé' used the sport, particularly the balls, as inspiration for the performances' bright aesthetic.
The performance featured Queen Bey in a tennis court, surrounded by an all-female dance troupe and live band who were all wearing the same colour.
But viewers were left completely baffled by the colour of Beyoncé's dress, with people taking to social media to debate whether the singer's outfit was yellow or green.
It seems no one knows the colour of tennis balls.
"Thank you Beyoncé for reigniting the 'are tennis balls green or yellow?' debate in our house," one viewer reacted after the performance.
Another Twitter user asked: "Is Beyoncé's dress (and in turn, a tennis ball) green or yellow?"
While one fan proposed: "Lime green, maybe".
And someone else tweeted: "I have many feelings about Beyoncé's performance and they all have to do with the tennis ball yellow/green".
One fan praised Beyonce's attire but was left confused about the colour, writing: "Of COURSE Beyoncé would look amazing even in tennis ball neon (yellow green?)"
The tennis ball is one of the most recognisable objects in sports, but their neon hue might confuse people.
According to an in-depth investigation by CNN into the history of tennis balls, the shade is officially called "optic yellow" by the International Tennis Federation.
A rule change in 1972 ruled that tennis balls should be white or yellow in colour. In 1986, Wimbledon changed the ball colour to yellow after TV viewers had difficulty seeing the balls.
Have we just witnessed the next blue/gold dress illusion thanks to Queen Bey?
King Richard is nominated for several awards at the 94th Academy Awards, including Best Picture, Best Actor for Will Smith, who portrayed Richard Williams, the father of Serena and Venus and Best Original Screenplay.