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: Federer has to work for second win It did not look like No. 1 vs. No. 240 at Arthur Ashe Stadium last night. Roger Federer may have expected to cruise in his first night match of this year #39;s US Open, but he got all 

Sports