Fifteen points in tennis? Nice. Thirty, 40 — even better. Advantage — that sounds good. "Love" — that also must be great, right? Well, not quite. As the French Open rolls on and Serena Williams has announced her return to the sport, maybe you've been paying a little more attention to tennis. The sport's scoring system is notably distinct, and can sometimes be hard to grasp for newcomers. But even tennis aficionados might not know why, or how, "love" became the unmistakable callout for zero points.