Oct 21 (Reuters) - The following are the top stories in the Wall Street Journal. Reuters has not verified these stories and does not vouch for their accuracy.

- The Justice Department filed a long-expected antitrust lawsuit alleging that Google uses anticompetitive tactics to preserve a monopoly for its flagship search engine and related advertising business, the most aggressive U.S. legal challenge to a company’s dominance in the tech sector in more than two decades. https://on.wsj.com/3jo0dtK

- Pioneer Natural Resources Co has agreed to buy Parsley Energy Inc for $4.5 billion, the latest in a flurry of U.S. oil tie-ups as companies seek to weather low prices brought about by the coronavirus pandemic. https://on.wsj.com/34hP

- Sinclair Broadcast Group Inc's regional sports business and its creditors are preparing for a possible restructuring of its roughly $8 billion debt load, a sign of the pressure on the sports industry from COVID-19, according to people familiar with the matter. https://on.wsj.com/2HkgZfY

- Netflix Inc said subscriber growth slowed in the third quarter, highlighting the fresh challenges the company faces from competitors ramping up their own streaming services as the pandemic continues to disrupt the entertainment industry. https://on.wsj.com/2HkYIis (Compiled by Bengaluru newsroom)