The diamond — which is the size of a tennis ball — was unearthed in Botswana by the Lucara Diamond Corporation. (fortune.com)
They disappear around the corner, and return a minute later with an armful of spherical objects about the size of tennis balls, beautifully wrapped, with a bow on each one. (premierchristianity.com)
The size of the rolls before the second rise should be smaller than the size of the tennis ball, but they will rise more in the oven. (sandraseasycooking.com)