Dinara Safina was forced to once again defend her number one ranking after squeezing by unheralded Kristina Barrois at the US Open on Thursday, her second successive struggle against an unseeded opponent.
Kim Clijsters lost the first set but roared back to beat Germany's Kristina Barrois 4-6, 6-2, 6-0 in the second round of the Paris Open on Wednesday.
Amelie Mauresmo was struggling against qualifier Kristina Barrois when rain ruled out play at the US Open.
India's Somdev Devvarman and Sania Mirza have been handed tough draws in their respective singles at the French Open, starting Sunday. Somdev will face Ivan Ljubicic of Croatia, while Sania has been drawn against Kristina Barrois of Germany.
Sania Mirza beat Germany's Kristina Barrois 6-3, 6-3 in her first round match at the French Open 2011.
World number one Caroline Wozniacki survived an early scare to win 10 straight games and crush German Andrea Petkovic 6-4, 6-1 on Thursday for a spot in the last four of the Stuttgart Grand Prix.