Tashigi is a good swordswoman but she’s not quite ready to take on Zoro just yet. Zoro’s just way too powerful and continues to get stronger in each arc. At this point he should be able to run rings around her and once he takes out his swords then it’s really all over. There just won’t be a whole lot that she could do to stop him and at the very least will need a more powerful sword. Zoro wins.