Yes, "love" or "nil" means a score of zero in racquet games (I learned that occasionally it´s said such in British football as well).
If you are a winner of a game in wich the score was a "love" (the opponent score was zero - say, if you won that 15-0.), then it can be said that "you have won a love game" (no pun intended - okay, pun-intended too.)http://ontennis.com/news/interview-sere ... eptember-8
See that in a question to Serena Williams...Q. How do you rate your performance tonight with Flavia? Especially beginning, because you made only I think four points on her serve until 5?4. Then finally you won love game at 5?4. Why then?