I might be wrong but Shelton will most likely play again tomorrow if he wins today.
So we should get a 2nd chance - he will face either Ruud or Fonseca.
I hope it will be Fonseca who should have a better chance against Shelton than Ruud.
Let's also hope for good weather with no rain tomorrow....just in case he wins today

There might be a very slim chance that he would play as well tomorrow, although very unlikely and that would also be heavily dependent on how soon Fonseca vs Ruud get concluded, because that would be starting later tonight that should starting be 7-8pm Montreal local time.
Why I said very unlikely is because there are at least for other matches for the round of 16 that have been confirmed, that are currently schedule for Saturday, where I would expect 2 for the afternoon session, then 2 for the session as well, that would ultimately push the Shelton schedule to Sunday...