Khan from range Alexander excels only against 'lesser' boxers. Don't forget Kotelnik beat him and Matthysse (on my card) Porter took a page from Bradleys book and executed a great gameplan against the taller man
Khan by tko accumulation stoppage alexander hasn't got the pop to ko khan, alexander hasn't looked like he's even hurt anyone in a fight since 2010. Worse stamina less busy I would say khan UD but I think he overwhelms alexander late on for the tko.