I can't think of a single reason why, when they announce the score at a women's match at Wimbledon, they might need to say Miss before the surname. They don't say Mr for the men's. I get that it's 'tradition', but really, why do they still do this in the 21st century?
It's only done at Wimbledon. At all the other Gram Slams they just use the surname, same as the men. Wimbledon is all about tradition, most of the players like it that way too and think it's a bit special for that reason.