In an USTA Junior tournament who decides what time you play your match?

I have a tennis tournament next saturday and its a 1 hour drive to get there and I play at 8:00 am and my brother plays at 9:00 am. Im 13 and Im going to play in the 16s and my brother is 10 and he is going to play in the 12s. But what I want to know is who decides what time I play my match because It kind of seems like both of us are playing early on purpose. No one else (besides our opponents) are playing that early.