Champions League last-16: the ties to watch and the upsets brewing

Ties that will define the round

The Champions League last-16 draw rarely disappoints, and this edition is no exception — a fixture list that pairs two of the tournament's most decorated clubs and hands several underdogs a genuine route to the quarter-finals.

The standout tie pits European royalty against a side in the form of their lives, with the fitness of the hosts' talismanic striker likely to decide the contest.

Elsewhere, a former champion's fragile defence faces the tournament's most clinical counter-attacking side — a mismatch that could produce the shock of the round.

• The heavyweight clash: two former winners meet over two legs
• The grudge match: a reunion with history between two rivals
• The upset alert: the group-stage minnows nobody wants to face

In the knockout rounds, form goes out of the window. Moments decide everything.