The Bolton boxer will be live on Sports 1 on December 13 and he told Ringside why he expects a successful night.
Khan believes his long list of attributes will overwhelm the outmatched Alexander at the MGM Grand on the Vegas strip.
???It???s going to be like a game of chess ??? hit and move. It???s whoever comes out stronger,” he said.
???I have the better punch power and the better knock-out percentage. I have a little bit more experience, I believe, in this fight. So it???s going to be tough but it???s a fight that favours me more because if it becomes a boxing match I can out-box Devon. He???s a good boxer but he???s not on the same level as me.
???I feel strong at this 147 weight plus I have Virgil Hunter in my corner telling me what game-plan to stick to and what technique to use in the fight. I???ve got a great team around me as well so I???ve not missed anything out.???
Khan did acknowledge that Alexander, a former WBC and IBF light-welterweight champion and a former IBF welterweight champion, possesses a threat.
He continued: ???Alexander???s a great fighter, he???s very tough and comes to fight. He???s southpaw, quite awkward, has good hands and a decent amount of power. So he???s very dangerous.
???He???s got a lot of experience under his belt, he???s a three-time world champion. Fighting for the title on a world stage, he???s tasted that before.
???I???m going to go in there and do everything I???ve learned.???
Khan v Alexander is live on Sports 1 from 2am on Sunday December 14.