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: Tennis: Serena Williams Reaches Finals of China Open Top seed Serena Williams of the United States has powered her way into the finals of the China Open tennis tournament in Beijing with a straight sets (6-2, 6-3) victory over fourth-seeded Vera Zvonareva of Russia.

Sports