camp, time your Zairs right and dont let him get under you, meta is a fast runner thats not a good thing for samus considering she depends a lot on her SHs meta can just get under her, if a nado hits you dont get nervous stay calm always stay calm and study when he does the moves that always hit you or get annoying follow the patterns, there is almost lways a pattern with mediocre metas, facing a pro meta just determines how much skill you have. If you get he uses nado and there is no chance in Runner, hold shield, dont let go, dont roll, dont spot dodge just hold shield and direction it to wherever he directons his nado and if your shield starts to get small and your about to get hit roll but only then samus has a ****ty roll so you have to make sure you time this right. Remember to always keep a charge shot on you, it breaks through nado and it destroys meta just dont waste it but spam it. Samus can shield a Dsmash and have time for a Fsmash to meta before meta does his 2nd Dsmash as most metas do dont overestimate metas Dsmash, although this is a given to small chars but when you have a combo going you normally get hyped up and sometimes try for a Usmash never do a Usmash unless on a stage with a curve such as halberd. If you must go off the edge, i know i do considering thats my playground, bewhere of his Up b and try for cheap spikes, meta is weak so once he is below you running dry of jumps use another spike dont try to edgeog him although it works almost 60% if you are good with it, he wont try nothing if you just swoop down for a spike. If he use his drill rush to try and get back then he is screwed just shoot a missile and try to spike him right after, missile stops drill rush and he has no time to get away if you follow with a quick spike. For his nado remember that if you atach it from above it cancels it out. If your on Battlefield Up b the hell outta him e will get annoyed and lse concentration, up b is samus's nado.
I have a lot more info on meta vs samus matchup but that should be enough because thats the main things that cause most problems ask for something if your not sure mea is my easiest matchup and i dont mind sharing stratigies at all. If you want me to send you some replays of me facing metas to see what im talking about just say so and i hope you can take care of that bat in your next tourny.