Can you identify this spider? !?

I live in arkansas and last night I saw a large wolf spider.... Well tonight... I saw this really large dark brown spider on my front door step. I sat their for a while before I got up to go in and realized it had been directly behind me the whole time with its legs it was aproximately 2 inches. It's abdoman was rather large and round and looked as if it had large spikes. Its legs were firry and its head appeared slick. It was entirely dark brown and I know it wasn't a brown recluse. It ran away as soon as I mad a loud noise.... What could it be?