Which Round of 16 matchup should you be most excited about?

Champions League knockout-phase action kicks off Tuesday, and with it, a slew of matchups that could go either way courtesy of the ever-looming influence of form.

Top-flight heavyweights accustomed to straightforward progression to the next stage are mired by uncharacteristic displays of late which is likely to result in an exciting eight-pack of clashes.

Here's a look at the first round of knockout matches ranked by their potential for all things appealing:

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