Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Casey Defends Decision to Fire Caddie  BLOOMFIELD HILLS, Michigan (Reuters) - European Ryder Cup  rookie Paul Casey has defended his decision to sack his caddie  five days before the start of the biggest team event in the  sport.

Sports