Russian Elena Vesnina and Spaniard Garbine Muguruza were both in trouble in their second round matches at the Miami Open in Florida before the weather came to their rescue.
Four days after the biggest victory of her career in Indian Wells, 13th seed Vesnina was facing defeat at the hands of Croatian wild card Ajla Tomljanovic, who led 3-6 6-4 5-3 when a thunderstorm halted play for the night.
The world number 594 will have more than 14 hours to think about the possibility of a huge upset before serving for the match when play resumes on Friday.
Sixth seed Muguruza, meanwhile, drew a blank in the first set of her match against 46th-ranked American Christina McHale, who led 6-0 2-3.
Earlier, Daria Gavrilova crashed 6-2 6-2 to Czech world No.36 Lucie Safarova.
The 2015 French Open runner-up, broke the Australian 23rd-seed five times while only dropping her serve once.
Czech second seed Karolina Pliskova cruised into the third round with a 6-1 6-3 win over Madison Brengle, while Dominika Cibulkova beat Paraguayan qualifier Veronica Cepede Royg 6-3 6-2.
Pliskova, a finalist at last year's US Open who reached the semi-finals at Indian Wells last week, relied on her booming groundstrokes and strong returning to dispatch her American opponent in 59 minutes.
"The last few matches it's not really about my serve because the percentage is a little low but I'm happy that I have my game from the baseline," Pliskova, who hit 27 winners compared to six for Brengle, said.
"I was feeling the ball pretty well today."
Pliskova controlled the rallies, winning six straight games to finish off the opening set and go up a break in the second.
Slovakian fourth seed Cibulkova faced only two break points against Royg and saved both in a win that set up a third-round clash with Belgian Kirsten Flipkens, who outbattled 29th seed Croatian Ana Konjuh 7-6(4) 6-7(6) 6-2.
Fifth seed Agnieszka Radwanska of Poland survived a first set tiebreak before dusting off China's Wang Qiang 7-6(3) 6-1.
Twelfth seed Caroline Wozniacki of Denmark was impressive in a 6-1 6-1 demolition of American Varvara Lepchenko 6-1 6-2.
with AP
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