I know this is a bit off topic, but I'm having a hard time to understand the races..
I've won the special awards from Esther in the S Rank races, but I can't seem to get the materias. It's always another prize. Is this completely random and I should just keep playing or is there a way to control it?

By the way, I'd prefer a dark red (wine coloured) or black chocobo and I would name it ... I don't know what I would name it. Maybe Sherlock, cos I'm watching Elementary at the moment