Hi, Cathy and
One of my favorite cucumbers is an heirloom variety called "Lemon" and they sure do come out looking a bit like tennis balls. But they're really delicious, and very prolific too. Reason they named them Lemon is because if you let them get mature, they turn bright yellow. But you should really eat them before they turn yellow so they are tender and sweet and never ever bitter.
Straight Eight is a good production cuke, but can be very bitter. The bitterness is a random thing with only some varieties, so better to avoid types that do this, in my experience.