#1 Ronaldo & Dybala vs Smalling & Lindelof
Smalling and Lindelof were United's best players in the last meeting between the two sides. Especially Lindelof was praised for his interceptions and tackles. Yet, the lack of quality in United's defence is eminent which needs to be addressed in January.
Both the central defenders would be up against the two of the best players in the world - Cristiano Ronaldo and Paulo Dybala. It would be a massive task to not only contain them but also stop them from scoring. Dybala scored the winner last time out and the rich vein of form he is in, it won't be surprising to see him score again.
Ronaldo looked a bit patchy at Old Trafford, but a player of his calibre could turn up in any game and win it. This battle would be interesting to watch, and if United's defence performs the way they did in the first thirty minutes against Bournemouth at the weekend, the game could be over before it even starts.