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: "Rafael Nadal defeated which 19-time Grand Slam titlist in the 2008 French Open for his fourth straight clay major title?" whose answer is Roger Federer.
Each document should contain about 30 words, and these documents should contain useful information.

Query: 19-time Grand Slam titlist men's singles tennis
Useful Output:

Doc 1: The Serb is now 84-36 in tour-level finals—19-10 at majors and 65-26 everywhere else. He now holds the all-time record for most five-set wins at
Doc 2: Rafael Nadal captured his 19th career Grand Slam title Sunday by winning his fourth US Open, outlasting Russia's Daniil Medvedev 7-5, 6-3, 5-7, 4-6, 6-4.
Doc 3: Boris Becker won the Wimbledon title in 1985 when he was 17 years and 228 days old to become the youngest men's singles champion at SW19. Among
Doc 4: McIlroy became the sixth man to win all four major championships, otherwise known as the career Grand Slam.  It closed out one of the greatest
Doc 5:  19-year-old Alcaraz has been the rising star on the ATP Tour this year, winning four titles already, including two Masters 1000 events and