One beautifully sunny Monday, we bought tickets to the China Open and watched some world-class tennis at the National Tennis Centre. We found out about the event from the flyers around the city, showing familiar faces such as Rafael Nadal, Novak Djokovic, Maria Sharapova and Serena Williams and bought tickets for £10. It was the best £10 each of us has ever spent – we didn’t know the line-up at the time, but we were about to see some of the most famous athletes of our time battle it out on the various courts of the Beijing grounds.