Eugenie Bouchard stunned No. 3 seed Samantha Stosur in the third round of the Family Circle Cup Thursday night.

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Bouchard, 19, defeated Stosur, 6-1, 2-0 as the Australian was forced to retire with a calf injury in the second set.

Only three singles matches and one doubles match were able to be played as the rain delay lasted seven hours. One of the first matches, pitting Jelena Jankovic and Jessica Pegula, that had originally been scheduled to start at about 11 a.m., finally got started a little after 6 p.m.

The ninth-seeded Jankovic easily dispatched Pegula, 6-0, 6-4. Bouchard, a qualifier, will face Jankovic Friday in the quarterfinals.

The big news about the evening session is that neither top-seeded Serena Williams nor fifth-seeded Venus Williams will play today.

The Family Circle Cup posted on its website, “Although play has not been canceled for the day, we will still honor tickets from Thursday’s day session during (Friday’s) day session.”

Today’s first match between Bethanie Mattek-Sands and Madison Keys was originally scheduled to begin at 11 a.m.

Mattek-Sands and Keys were scheduled to play on the Althea Gibson Court but moved to the main court after Andrea Petkovic withdrew from her scheduled match with former champion Caroline Wozniacki, citing an injury to her right calf. Later, the Mattek-Sands and Keys match was moved back to the Gibson court and another match moved to Court 3 as tournament officials tried to get matches in.

Petkovic, from Germany, is unseeded but finished the 2011 WTA season ranked No. 10. She tweeted that she is suffering from a right calf injury.