U.S. Open champion Angelique Kerber officially became the oldest woman to debut at No. 1 in the WTA rankings, ending Serena Williams' record-tying run of 186 consecutive weeks in the top spot.
Monday's rankings are the first since February 2013 without Williams at No. 1.
The 28-year-old Kerber's rise from No. 2 was assured when Williams lost in the semifinals at Flushing Meadows.
Kerber went on to beat Karolina Pliskova in Saturday's final for her second Grand Slam title of the season. She defeated Williams at the Australian Open in January, then was the runner-up to the American at Wimbledon in July.
She is the first woman from Germany to be ranked No. 1 since...