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: Relentless Hewitt in quarters LLEYTON HEWITT continued his red-hot run to reach his fifth straight US Open quarter-final at Flushing Meadows today. Australia #39;s 2001 champion obliterated unseeded Slovak Karol Beck 6-4 6-2 6-2 in 1hr 40min 

Sports