Medvedev or Nadal would probably the best picks.
Djok is hurt and played more tennis than he would’ve liked to at this point. Most likely draw is Raonic, Zverev, Theim, Nadal which is absolutely ridiculous for the world #1.
Zverev has to play either Djok or Raonic (coming off with confidence from beating Djok) and then Theim, Nadal/Med
And Theimis coming off a 5-setter against a well-rested and good form Dimitrov and is just not as good on Hard court to me as Med and Nadal although he is amazing