FLUSHING, N.Y. — Against the blue and green of the Billie Jean King Tennis Center courts, the yellow ball careening between two rackets stands out. That’s before you see the yellow balls up in ...

They have a limited spectrum, and bright yellow—yes, tennis balls are yellow—is one color that stands out to them. This means that even when you throw it impossibly far away, they can still ...

At least that is the hope of Belgian eco-designer Mathilde Wittock, who fashions bespoke furniture from discarded tennis balls. Wittock’s sleek, modernist chaise longues are entirely cushionless ...

Learn more about it. Sure, all fuzzy yellow tennis balls may look the same at a glance, but you may be surprised at how much a ball’s composition can affect your gameplay. You need the right ...