You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who has won the 2017 men's singles wimbledon tennis tournament?" whose answer is Roger Federer.
Each document should contain about 30 words, and these documents should contain useful information.

Query: 2017 men's singles wimbledon tennis tournament winner
Useful Output:

Doc 1: Roger Federer won the Wimbledon 2017 men's singles title. He defeated Marin Cilic in the final to secure the championship. This victory marked
Doc 2: Roger Federer won a record eighth Wimbledon title after beating Marin Cilic 6-3, 6-1 and 6-4 at the 2017 edition of the tournament in London
Doc 3: Roger Federer won his eighth title at Wimbledon. Follow what happened with our full tournament coverage right here.
Doc 4: July 3 - July 16. The 2017 Wimbledon Championships will largely be remembered for Roger Federer's record-breaking eighth men's single title.
Doc 5: Roger Federer won a record eighth Wimbledon title and became the tournament's oldest champion Sunday with a straight-sets victory over injury-hit Marin Cilic.