The Road to Singapore is heading into the final stretch; can Simona Halep, Karolina Pliskova, and defending champ Agnieszka Radwanska all book their spots in the WTA Finals?
WTA Staff

Angelique Kerber and Serena Williams have already booked their spots in the upcoming BNP Paribas WTA Finals Singapore presented by SC Global, and while Karolina Pliskova can't assure herself of a spot this week, her results at the Toray Pan Pacific Open could make her road to qualification even easier as the Asian Swing kicks into high gear.

Seeded No.3 in Tokyo, the US Open runner-up is the highest-ranked woman on the Road to Singapore leaderboard playing this week. RTS No.3 Simona Halep was forced to withdraw due to a left hamstring injury, but is still in pole position to reach Singapore for a third straight year. Set to return to the court in time for the Dongfeng Motor Wuhan Open, the Mutua Madrid Open and Rogers Cup champion could book her ticket by reaching the final, possibly the semifinal based on other results.

As it stands now, Pliskova would have to win Wuhan to guarantee her WTA Finals debut, having narrowly missed out on qualification in 2015 - but a good run in Tokyo will likely take the pressure off as the race heats up.

Agnieszka Radwanska

The same goes for defending WTA Finals winner Agnieszka Radwanska, who is seeded No.2 in Tokyo and last year's champion. Ranked No.5 on the Road to Singapore leaderboard, the Pole can lessen her Wuhan load with a strong swing through the Japanese capital.

Further back from Radwanska is French Open champion Garbiñe Muguruza, who reached the semifinals last year in her debut with a perfect 3-0 round robin record. Muguruza is the top seed in Tokyo, and has a 500 point lead over No.7 Dominika Cibulkova. Her chances of a second straight Singapore appearance are strong, but replicating last year's stellar fall swing would doubly assure her chances of a return.

In doubles, Sania Mirza appears to be aiming for a second qualification spot, despite already assuring herself of a return to Singapore with former partner Martina Hingis. Pairing up with Barbora Strycova at the Western & Southern Open, Mirza is ranked No.19 with her new partner, but is set to play the Toray Pan Pacific Open this week and could narrow the 500 point gap between her and the Top 8 with a title in Tokyo.

Click here to learn more about the doubles storylines and qualification scenarios in the latest Insider Doubles Take.

Check out the Top 8 and click here for the full Road to Singapore leaderboard: