Maria Sharapova was in America at 18.
Maria Yuryevna Sharapova ( Мари́я Ю́рьевна Шара́пова ; born April 19 , 1987 ) is a Russian professional tennis player . A United States resident since 1994 , Sharapova has competed on the WTA tour since 2001 . 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 .