He had a good game, and I don't think he is the unmitigated disaster that people often say he is. On the evidence of this season, Bailly is the only sure pick at CB, which leaves Smalling, Blind and Rojo (and Jones...) to fight it out for the other spot. Smalling is taller and stronger than Rojo, but significantly worse in possession, and has a worrying tendency to shirt grab. Blind is unsurprisingly the best passer of the three by some distance, and reads the play well. He's my personal preference to partner Bailly, despite his oft-mentioned physical shortcomings.
Rojo isn't as physically imposing as Smalling, but more confident in possession, and the reverse when comparing him to Blind. So he's got the potential to stake a claim for a starting berth.
It's also interesting that he hasn't let his head drop or shrink away from the pressure, like some others in the squad.