Serena Williams returns to the Top 10 on Monday for her 793rd week inside the WTA Top 10, the most among all active players. The last time Serena was ranked in the Top 10 was July 17, 2017, six months after she won her 23rd major title at the 2017 Australian Open. 

The American's return to the Top 10 comes nearly 20 years after she made her initial debut on April 4, 1999, when the Top 10 looked like this: 

No.1 Martina Hingis
No.2 Lindsay Davenport
No.3 Jana Novotna
No.4 Monica Seles
No.5 Steffi Graf
No.6 Venus Williams
No.7 Arantxa Sanchez-Vicario
No.8 Mary Pierce
No.9 Serena Williams
No.10 Patty Schnyder

Serena's return to the Top 10 comes just 11 months since her return to the tour in March of last year at the BNP Paribas Open in Indian Wells. Playing in her first tournament in 13 months, Serena returned to the tour ranked No.491. By the time she played the fourth tournament of her returned - a run to the Wimbledon final - Serena was back in the Top 100 returned to the Top 100 after advancing to the Wimbledon final - just her fourth tournament - and back in the Top 20 two months later after making her second consecutive major final at the US Open. 

Meanwhile, World No.2 Simona Halep continues to have the longest active streak for consecutive weeks in the Top 10. The 27-year-old made her Top 10 debut on January 27, 2014 and has never left, extending her stay to 265 consecutive weeks on Monday. No.5 Karolina Pliskova holds the next longest active streak at 128 consecutive weeks.

Here's how the Top 10 looked with Halep made her debut on January 27, 2014:

No.1 Serena Williams
No.2 Victoria Azarenka
No.3 Li Na
No.4 Agnieszka Radwanska
No.5 Maria Sharapova
No.6 Petra Kvitová
No.7 Sara Errani
No.8 Jelena Jankovic
No.9 Angelique Kerber
No.10 Simona Halep 

Halep's 265-week streak is the longest Top 10 run since Serena held a Top 10 position for 276 consecutive weeks from April 2, 2012 to July 17, 2017, a streak that ended due to pregnancy. 

Venus Williams holds the longest streak of any active player, having been ranked in the Top 10 for 293 weeks from March 30, 1998 to November 10, 2003.