Karolina Sprem 3-6 6-1 6-2 . The 26-year-old 's career had nosedived following her highly-publicized split from controversial mentor and father Damir . Dementieva will next play Australian 30th seed Samantha Stosur , who won her second-round match in straight sets against Belgium 's Yanina Wickmayer . Earlier on Thursday , the Williams sisters also progressed through to the third round with contrasting victories . Second seed Serena crushed Virginia Ruano Pascual 6-2 6-0 to set up a clash with another unseeded Spaniard , Maria Jose Martinez Sanchez . Third seed Venus survived a scare against unseeded Czech Lucie Safarova before completing a match that was halted on Wednesday night due to bad light . The American saved a match point at 5-4 down in the third set before managing to hold , break her opponent and then serve out to love for a 6-7 -LRB- 5-7 -RRB- 6-2 7-5 success . Venus , who lost the 2002 final to Serena , will next play Hungarian 29th seed Agnes Szavay . Fifth seed Jelena Jankovic had no such troubles in beating Magdalena Rybarikova of Slovakia 6-1 6-2 , setting up a third-round clash with unseeded Austrian Jarmila Groth . Seventh-seeded
Fourth seed Elena Dementieva avoided an embarrassing early exit when comeback queen Jelena Dokic 's French Open hopes were ended by a back injury on Thursday . Jelena Dokic was left in tears after being forced to retire hurt against Elena Dementieva at the French Open . Dokic , taking part in her first French Open since 2004 following well-documented family problems , won the first set 6-2 and -- after her first break for treatment -- broke the 2004 finalist to lead 3-2 in their second round clash . But the Russian won the next two games as the tearful former world No. 4 was reduced to walking pace before calling it quits . `` I went for a return and I just went down and could n't get back up , '' she said . `` It 's very painful and very disappointing because I felt as if I had the match in my hands . '' Dokic , now ranked 80th after reviving her career with a run to the quarter-finals of the Australian Open in January , had won her opening match on Tuesday when she came back from a set down to beat Slovenia 's