BY THE NUMBERS
Consecutive weeks Serena Williams has been No. 1 in the WTA rankings. She is in danger of dropping out of the top spot this week. Kerber has played 22 tournaments this year to Serena’s 15.
Weeks Steffi Graf spent at No. 1, the longest streak in WTA history. She was the queen of the game from 1987 to 1991.
Total weeks Graf spent as the No. 1 player in the world. Martina Navratilova is second on that list with 332 and Serena Williams is the only other player in the top spot for more than 300 weeks with 301.