Are tennis balls yellow or green? This age-old debate has sparked countless discussions and divided opinions across the nation. Even tennis, Roger Federer has weighed in on the topic.

Also called stage 2, orange tennis balls were ... (green), and then on to the standard ball. These are the last level of beginner-specific tennis ball—if red balls feel not quite right, you can ...

largely as the white balls were getting stained green on the grass, sometimes making them almost impossible to see on TV, where tennis was increasingly popular.” ...

This was around the same time the balls defaulted to the optic yellow color to make for easier visibility when games were broadcast on television. So will a sealed can of tennis balls last for years?