Serena set to return to No.1 on April 24, but Kerber can reclaim top spot in Stuttgart!

Serena Williams will return to No.1 on the WTA Rankings on April 24, 2017 - when the points from last year's Porsche Tennis Grand Prix in Stuttgart drop off.

Two-time defending Stuttgart champion Angelique Kerber will have an immediate chance to return to the top spot by reaching the semifinals of this year's event, which takes place a week later this year due to a shift in the calendar.

As top seed in Stuttgart, Kerber, who has held the No.1 ranking for 25 weeks, will receive a first-round bye, so will need to win two matches to overtake Williams.

2016 START DATES TOURNAMENTS 2017 START DATES APRIL 18 STUTTGART APRIL 24 MAY 2 MADRID MAY 8 MAY 9 ROME MAY 15 MAY 23 ROLAND GARROS MAY 29 JUNE 11 BIRMINGHAM JUNE 19 JUNE 20 EASTBOURNE JUNE 26 JUNE 27 WIMBLEDON JULY 3 JULY 18 STANFORD JULY 31 JULY 25 MONTREAL / TORONTO AUG 7

The WTA Rankings are based on a 52-week, cumulative system with each player's singles ranking determined by 16 best results; WTA Finals participants count points earned as the 17th bonus tournament.

For Williams it will be her 317th week at No.1, the third most in WTA Rankings history behind only Stefanie Graf (377) and Martina Navratilova (332).