Tennis writer Steve Flink, in his book The Greatest Tennis Matches of the Twentieth Century, named her as the best female player of the 20th century.
She denied using the drug, but decided not to appeal the imminent ban.
She then climbed to world number 6 and won three singles titles.
She also holds the open era record for finishing as the year-end World No.
Graf was ranked World No.
On 1 November 2007, Hingis announced her retirement from tennis after testing positive for cocaine during Wimbledon in 2007.