World cites poor form .
World doubles # 1s Martina Hingis and Sania Mirza have announced that they will play the rest of the season with other partners , but will reunite for the season - ending WTA Finals in Singapore .
Citing poor form , world doubles # 1s Martina Hingis and Sania Mirza have announced that they will play the rest of the season with other partners , but will reunite for the season - ending WTA Finals in Singapore .