Khan knows victory on the Strip could pave the way for Floyd Mayweather showdown.
Khan v Alexander is live on Sky Sports on Saturday 13 December.
Amir Khan v Devon Alexander:
12 Rounds Welterweight
Keith Thurman v Leonard Bundu:
Interim WBA Welterweight Title
Jermall Charlo v Lenny Bottai:
12 Rounds Light-Middleweight
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