A saber battle Anakin would win about 7/10, methinks.
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Yes. Unless Leia is nearby and Luke goes "In teh force avatar jesus god light zone!!111!!" (it's the new 'in teh zone'), like he went on Palpatine in their second duel, Anakin should take a 6 or 7/10.
Anakin pulls it off through the raw power and brute force that he has always used. Luke could not defend against this if Anakin really tried to kill him.