Soweto - With just over an hour's play possible on day four of the Soweto Open at the Arthur Ashe tennis centre on Thursday, play was postponed and later called off for the day.
The men's quarterfinal and the men's doubles matches scheduled for Thursday were postponed.
There are also four women's singles matches and one doubles quarterfinal still to be completed.
The number-one seed Anne Keothavong of England is 2-1 up in the third set of her match against Eirini Georgatou of Greece.
The number two seed, Czech Petra Cetkovska, looks on course for victory against Kiki Bertens of the Netherlands, as she won the first set 7-6 (6) and is 5-1 up in the second.
In the women's doubles, the South African pair of Surina de Beer and Chanel Simmonds took the first set against their opponents, Valeria Savinykh (RUS) and Corinna Dentoni (ITA), 6-1 and is 3-3 in the second.
Incompleted scores on 14 April:
 Anne Keothavong (GBR) leads Eirini Georgatou (GRE) 7-6 (3) 3-6 2-1
 Petra Cetkovska (CZE) leads Kiki Bertens (NED) 7-6 (6) 5-1
 Kathrin Woerle (GER) leads  Nina Bratchikova (RUS) 7-6 (5) 4-4
Valeria Savinykh (RUS) leads  Corinna Dentoni (ITA) 6-4 4-1
Surina de Beer (RSA)/Chanel Simmonds (RSA) lead Ana-Clara Duarte (BRA)/Teodora Mircic (SRB) 6-1 3-3