I'm not talking about matches from distant past, for example those of Mo Conolly or Helen Wills, but about those matches you had a chance to see but somehow didn't.
RG final '98
Arantxa, my number 1 fave back then beat Lindsay, my number 2 fave in the semis. I was very pissed off, and that made me realize how much I actually liked Lindsay. So I had little desire to watch the final, as I thought Monica would win easily, and instead I went out. When I came back late that night my mother asked me "Who do you think won the final?" I was like: "Well Monica, duh." And she said: "Well no, Arantxa did." She also told me about the award ceremony and Arantxa apologizing to the crowd etc. I still regret not seeing that match.
I'll absolutely never forgive myself for not seeing the RG final '99. I don't even know why I didn't watch that match, I thought Martina was going to win, and I couldn't bring myself to watch her beating Steffi. 5 minutes after the match was over my friend calls and he was so excited, he was yelling: "Hey, did you see that, wow it was amazing, Steffi was so good blablabla..." I couldn't believe it. The whole day people were calling me speaking about that match, and I was like "Could you just leave me alone and let me shoot myself, please?" Of course, later I got the tape of that match, but it wasn't the same.
And I'm also sorry I didn't watch the final of Wimbledon last year, but that's another story, as the tournament wasn't broadcasted on any chanel of my cable TV.