A love game means that you or your opponent score 4 points in a row in one serve. You won the serve and your opponent didn't score a point. Why use love? Actually, this word comes from French. In the past, nobles played ball games, for example, 30-0 was zero, which was pronounced "love" in French. People find it difficult to read zero, so they simply pronounce it LOVE, so there is LOVEGAME. What I just said is to win the service for four consecutive points. Actually, it's (a 40: o game).