Dozens of children compete for the privilege of being ballboys and girls at the Marlboro Tennis championships, which end tomorrow. The chosen few are trained several weeks before the competition starts, then given a uniform and a schedule for their four to five-hour shifts on court. Children as young as 10 are trained up so after several tournaments they are experienced enough to man the nets - the top ballboy post. Scurrying after tennis balls on a sunbaked court is all in an afternoon's work for the 60 children selected. For German International School student Nadia Wong Wei-juin, 12, and her brothers, the excitement is in seeing the stars perform. What's on your mind? Getting signatures and autographs - that is all. I've got five so far today. How did you get involved in the championships? My mum and my brother helped me enter. I was a ballgirl last year and I thought it was fun. We can meet the players and learn how to play better. We can also get their signatures and see them on court. They're all friendly. What's your tennis like and how did you become involved? I'm average. I've been playing for three years, all year round. One of my cousins used to play, and my brothers and I liked watching. We went on a camp with him and then we started to play ourselves. What is your day like during the championships? School starts at 7.40 am and ends at 1.15 pm, so I don't miss any school. It's fun - I don't think it's a chore. You're only on the court for an hour and then switch with other people. I don't know how much I get paid and I don't care. What happens after the matches are over? We sometimes watch the good matches or we run around and get signatures. I've got about eight - I want to get [Jonas] Bjorkman, then that will be about it. We also get tickets to get some food. What's it like being surrounded by famous tennis stars? Most of them are really friendly. I don't have a favourite player because I like all of them. We are allowed to go into one room that the public can't go into, but we're not allowed to go into the locker rooms. Have there been any funny moments? There was a cat running around the court one day. It came out from the side and it was running around and fell on to the net. It tried to hang on to the net and then it fell off.