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: Ragged Federer moves up World number one Roger Federer struggled through an unexpectedly tough opening win on Tuesday night against outsider Nicolas Thomann, finally grabbing a 6-4, 7-6 (7-4) victory at the \$550,000 Thailand Open.

Sports