The original color of tennis balls was white.
While today we primarily associate tennis balls with bright yellow, this wasn't always the case. White tennis balls were the standard for decades, dating back to the sport's early days.
The switch to yellow came about in the 1970s. The primary reason for this change was to increase visibility on television broadcasts. Yellow stood out more against the green grass courts, enhancing the viewing experience for audiences.
While the color change was initially met with some resistance, it quickly became the norm. Today, yellow is the dominant color for tennis balls, although white tennis balls are still available and are sometimes used in specific contexts.