Suggested by iKnowledge Mileena is likely a more talented close quarters fighter than Asuna due to having more more experience on the battlefield. Even the 3 years in Aincrad wouldn’t put Asuna over that. That said, Asuna has more abilities than Mileena and her sword skills are far from normal. She should be able to quickly overpower Mileena in battle due to the big gap in their respective strength levels. Additionally, Asuna has greater speed and would be able to slice Mileena before the fighter could get her guard up. Repeat that for a few hits and it’s all over. Asuna wins.