Penn QST 36 tennis balls. If you're new to tennis, it's best to start out with a set of tennis balls that can help you gain control and more experience.

The Western & Southern Open began this week in Mason, but its 12,000 Penn tennis balls arrived in July, comfortably stowed underneath Court 3.

Penn product manager Steve Morris told the Tribune that white tennis balls played on “nostalgia and collectors’ ‘edition sense.’” Not everyone agreed.