Probably I'd get turned on more if she lost, and like it's been said before here, it's a strange thing, I'd like a good psychological explanation for that myself sometime, haha!
This question reminds me of a particular time when I had a girlfriend about 5'2" whom one day I saw with a woman in the neighborhood who was so tall and massive, I think my girlfriend not even quite reached her shoulders and the other woman was also obviously very strong. I fantasized a lot about the two having a confrontation, but it was more about humiliation (not physical harm) - like the other woman bumping her enormous boobs into her face, keeping her head locked under her arm and then putting her across her knees to spank her. The image of my girlfriend in her helpless rage and frustration while the other woman would laugh at her and play with her like with a doll was what seemed sexy, but in real life I wouldn't have enjoyed it at all. The end of the fantasy, with my girlfriend leaving in tears, exhausted and humiliated and the other woman still laughing and ridiculing her, was something really hot and exciting but also gave me an extremely awkward feeling about myself. About physical injuries from brutal fighting I never even fantasized, my partner inflicting them wouldn't turn me on, and her receiving them I'd find more upsetting than anything.