Grouchy yes, I think they are following the way Australia/US do it- where matches are starting times of 'not before x time'. Suppose they were confident about the weather then- no possibility of playing under a roof at RG.
Mind you, I think the US Open schedule is entirely planned with the tv in mind, rather the the players. And Aus, with matches finishing in the early hours.
I love how Fabrice says 'Overhead' 