Well, Antman still retains his full-human size strength when he's ant size. So, He has that going for him. Plus, Im pretty sure the size change happens very quickly. Lots of groovy attacks could come from this. All in all, WW can't lasso him when he's small, and he doesnt need to be big to hit her fairly hard/throw somthing at her. And Im not sure if WW has super sight. If not, she couldn't see AM most of the time. Really, all AM needs to do is get in her ear and give her eardrum a good boxin. Hurt like hell, as he retains full strength. Probably even break it, and start punching away at her brain. Least thats how I'd go about it if I were Ant Man.