Qualifying begins: 26 June
The Draw: 30 June
Pre-event Press Conferences: 1 & 2 July
Order of Play: 2 July
Championships begin: 3 July
COME BACK FOR LIVE SCORES & LIVE BLOG FROM 26 JUNE
Agnieszka Radwanska d. Karolina Pliskova 7-5, 6-3
There's something about this match-up that Radwanska just seems to relish. Seven times these two have met now, and seven times the Pole has won in straight sets, with this particular victory sealing her passage to her fourth semi-final at the WTA Finals.
A de facto quarter-final, this was a winner takes all clash, and it was Pliskova who came out firing, losing just one point in her first three service games before drawing first blood to move 4-2 ahead.
Radwanska, though, slowly wrestled back control through some efficient, clever tennis, and eventually took the first set courtesy of a searing forehand winner down the line.
Pliskova once again stole ahead in the second set, but Radwanska rallied from 3-2 down, fending off a break point in the seventh game before accelerating away to set up a meeting with top seed Angelique Kerber in the semi-finals.
Verdict: 2015 champion Radwanska was at her cool and composed best here to twice overturn deficits against an opponent who, when hot, is near enough uncontainable. The last player into the semi-finals, she's also the only one of the four to have reached this stage before, and she'll need to draw on that experience against Kerber.
Pliskova has enjoyed a tremendous end to the season, and a berth at the Finals was a just reward. There were opportunities for her to progress here, though, and she must surely be disappointed to have twice let leads slip. Still, it's been a strong debut here for the Czech, and as she said, the experience she has gained should stand her in good stead for the future.
"Next year maybe I will go out of the group. Right now I know how it is to play here - I got used to it, the system. Hopefully I'll be back."
Garbine Muguruza d. Svetlana Kuznetsova 3-6, 6-0, 6-1
The only dead rubber in the competition, Muguruza looked to be exiting without so much as a whimper after the first set.
But in a remarkable turnaround, the Spaniard reeled off 12 of the remaining 13 games to secure a morale-boosting victory that will hopefully provide her with a platform to build from in 2017.
Kuznetsova, who may understandably have had one eye on the semi-finals, faded as a force in the second and third sets, allowing Muguruza to power away for her first victory of the tournament.
Verdict: "It's been a hard year for me for sure," said Muguruza in her post-match interview. An odd statement, perhaps, for someone who won her first Grand Slam title and hit a career-high ranking in 2016. But Muguruza has seen that kind of form vanish since Roland Garros, and she couldn't fully rediscover it in Singapore. She showed plenty of character in the second and third sets, however, and one hopes she can get back to her fearsome best in 2017.