Victoria Azarenka spends her 12th week at No.1 this week.
Azarenka passes seven-time Grand Slam champion Venus Williams on the all-time list and ties Arantxa Sánchez-Vicario and Ana Ivanovic, who have four and one Grand Slam titles, respectively.
Liezel Huber spends her 179th week at No.1 in doubles this week. She is in second place on the list, now 58 weeks short of the all-time leader, Martina Navratilova, who has 237 weeks.