This film has been bugging me for years. All I can remember is a scene and a sort of 'feeling'.
The film is pretty old maybe 50's but could be 40's. I was certain that Shelley Winters was the star as a girl in her late teens/early twenties but I've gone through her IMBD and can't find anything likely.
I think it's black and white. There is a scene where I think the girl (possibly Shelley Winters but maybe not) is either playing or watching a game of tennis. It's a very tense moment in the film. She also has a younger sister. There's a boyfriend around and I think he is trying to murder her, the girl not the sister. She's portrayed as being a bit easy as the americans call it.
That's about it but I know that I've seen it a couple of times a long time ago and I really enjoyed it.