Board Thread:Questions and Answers/@comment-25908228-20141222101442/@comment-99.180.73.85-20151004064102

Asuna has stated in the light novels that she can't stand up to Kirito. It was the side chapter with Lisabeth.

“Should I say that he’s unpredictable, or that he just takes everything at his own pace... yet in spite of all that, he’s really strong.” (Asuna)

“Oh, stronger than you?”(Lisbeth)

“Yeah, like really; if we dueled, I wouldn’t even last one minute.” (Asuna).

They might be closer now but Kirito doesn't take games as seriously as he did when they were life and death. Even with Yuuki's sword skill in her possession; I doubt the result would change. There's no definitive way to tell for sure as they haven't fought since Rosario but If she was that far behind in Aincrad then the result is probably the same.