In this scenario all Daffy has to do is avoid getting caught by Morlun, not outfight him. In this case I should remind people that Daffy, like Bugs, is fast enough to dig to an entirely different continent within a few minutes. For example in the episode “The Abominable Snow Rabbit” we see Daffy start in the Himalayan Mountains and then follow Bugs and the titular Snowman as they dig all the way to Palm Springs, California, within the span of a few minutes:
So for this match Daffy might be too fast for Morlun to catch and so baring any surprise attacks Daffy could definitely avoid being nabbed by Morlun for a week.