On February 18, 2013, Serena Williams returned to No.1.
It wasn't the first time she had risen to the top of the rankings; she had previously held the position for 129 non-consecutive weeks across five occasions. But in 2013, Williams' return to the top spot was even more significant as she hadn't been No.1 in over two years after a foot injury and pulmonary embolism left her career in question.
Overcoming incredible adversity to put together her comeback, Williams took the No.1 ranking from Victoria Azarenka three years ago after defeating Petra Kvitova in the quarterfinals of the Qatar Total Open. And she hasn't given it up ever since.
Now, 186 weeks later, Williams has tied the WTA record for most consecutive weeks at No.1, a feat achieved by Stefanie Graf from August 17, 1987 to March 10, 1991. During her reign at the top, Williams has also equaled another one of Graf's records, having claimed her 22nd major title earlier this year at Wimbledon.