It's Sania Mirza and Martina Hingis who progress to the semi-finals at the WTA Finals Singapore with a stellar performance! They win 7-6, 7-5 with a solid fight from the Chan sisters.
Martina Hingis' experienced hands take this to game, set and match!
Mirza and Hingis BREAK with a well-timed lob from the talented Sania and they'll now serve for the match.
How speedy is that Martina Hingis serve?
The Chan sisters have raced to game point here in Singapore!
And it's raining breaks here! Scores are level again. It's been some time sine anyone held serve here.
But the breaks have been courtesy some net cords for the Chan sisters. the Hingis-Mirza combine still works well, but their mojo appears to have dulled somewhat following the split.
And it's the third consecutive break. Hingis and Mirza are once again up a break of serve here in Singapore, leading 3-2 in the second.
A netted lob from Hao-ching Chan gives Mirza the point - and now it's the third consecutive break point after a long shot from her sister.
That thrill didn't last too long. Chan and Chan pull out some great tennis after a pep-talk from their coach and father - and they break back - to LOVE!
The rallies are getting stronger and longer and it's Mirza and Hingis who take the first break in the second! They lead 2-1.
And an ace to seal it from Sana Mirza, just like that!
A wonderful rally from both teams for that point! Mirza and Hingis throwing everything but the kitchen sink at that one and there's net play, court play and the Indian bringing the ball back into play from apparent death!
And at 11-10, there's a ridiculously close set that goes to Mirza and Hingis!
Set point Chan-Chan! The THIRD one. And now scores are at 10-10. Tiebreak in a tiebreak.
Break back! We'll now see a first set tiebreak!
Oops! That's the first break of the match which goes to the Chan sisters and they will now serve for the set.
Now the Chan sisters will serve to stay in the set!
Mirza and Hingis have strategically been using a combined strategy, with one player at the net and the other further towards the baseline.
Mirza and Hingis are receiving a bit of advice from Mirza's coach and father Imran, who is suggesting they rush the net a bit more.
Beautiful slice from Yung-jan Chan there cleanly bisects Mirza and Hingis to bring the scores level again.
Hingis places that forehand near-perfectly for the final point of the game. 4-3 to the Indo-Swiss pair!
Some classic SanTina rallies from the two today. Despite the split, the pair appear to have their coordination of old.
And that's why Martina Hingis and Sania Mirza were so successful. Hingis brilliant around the net there and Mirza brings out a quick lob. Quickly they take the game for a 3-2 lead!
It's a hold for the Chan sisters. Scores are level at 2-2 with no breaks of serve.
Venus and Serena Williams were one pair, and Katerina and Manuela Maleeva of Bulgaria were the other.
The Chan sisters are only the third pair of sisters to play the WTA Finals.
Yung-jan is unable to reach that shot, and it's now back to deuce.
Mirza's forehands are absolutely rocketing here! A speedy rally with the Chan sisters sees Hao-Ching scoop a shot to Mirza, who unfortunately nets that one. Advantage Chan-Chan.
They hold on courtesy Mirza's stellar shot placement today! That one bounced UNDER the racquet of Hao-ching Chan.
The Chan sisters are at break point.. and now deuce! Can Sania and Hingis hold on?
Great shot from Yung-jan Chan! She's near the net and staves off what would've been a sure point for Hingis, rushing the net to convert the Swiss' lob to a nice spinning shot.
And that's the first set to Sania Mirza and Martina Hingis! They lead 1-0 with a good hold of serve.
Hingis and Mirza open serve here and quickly take a lead!
Sania Mirza now partners Czech Barbora Strycova, while Hingis has paired up with American Coco Vandeweghe.
Mirza and Hingis split earlier in 2016, but having qualified together for the tournament, will play together here.
Mirza and Hingis are the defending champions in Singapore, defeating Garbine Muguruza and Carla Suarez-Navarro in the finals in 2015.