Has play been cancelled for the day? I know he is too late in the schedule to play but if they don't finish some matches there is going to be a massive backlog.
His match is rescheduled to tomorrow, the second play at court 9.
The other thing is taht Grigor is not on the London 2012 entry list according to his 72 ranking this week
but if Belgium follow their rule 2008 then he will be in, or he needs a WC