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: "Which tennis player was born first, Ken Rosewall orJelena Janković?" whose answer is Kenneth Robert Rosewall.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Jelena Janković birth year
Useful Output:

Doc 1: Full name Jelena Jankovic · Nickname JJ · Birth date February 28, 1985 · Birth place Belgrade · Current age 40 years 33 days
Doc 2: Explore the career and performances of Jelena Jankovic. Access all stats, latest  Date of Birth. Feb 21, 2005. Height. 187 cm / 6'2". National Team. SRB
Doc 3: Jelena Jankovic (SRB). Country: Serbia, Born in 1985 (40 years old), Category: WTA. Profile | Ranking | Results | Statistics. Place of birth. Belgrade, Serbia.
Doc 4: Jelena Jankovic was born February 28, 1985, in Belgrade, Serbia. She is one of the top female tennis players in the world and former world's number one.
Doc 5: Jelena Jankovic is a basketball player born on February 21, 2005. Her height is six foot two (1m87 / 6-2). She is a center who most recently played for U16