Maria Sharapova retired from tennis by 2000.
Maria Sharapova . Sharapova became the world No. 1 for the first time on August 22 , 2005 , at the age of 18 , and last held the ranking for the fifth time for four weeks from June 11 , 2012 , to July 8 , 2012 . In March 2016 , Sharapova revealed she had failed a drug test at the 2016 Australian Open on January 26 , 2016 .