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 is the defending ladies' singles champion?" whose answer is 2018.
Each document should contain about 30 words, and these documents should contain useful information.

Query: defending ladies' singles champion
Useful Output:

Doc 1: Madison Keys beat Aryna Sabalenka 6-3, 2-6, 7-5 in the women's singles tennis final at the Australian Open. The match was played at Rod Laver
Doc 2: Marketa Vondrousova won this point to claim her first Wimbledon Ladies' Single title. SUBSCRIBE to keep up with all The Championships action
Doc 3: Defending champion Simona Halep has pulled out of Wimbledon with a calf injury. The Romanian, who produced a stunning display to defeat Serena
Doc 4: Markéta Vondroušová, the defending Ladies Singles Champion last year, lost in the first round to Jessica Bouzas Maneiro in straight sets.
Doc 5: Madison Keys of the U.S. celebrates after defeating Aryna Sabalenka of Belarus in the women's singles final at the Australian Open tennis