Home favourite Marion Bartoli shook off some first-set rustiness to defeat Croatian Petra Martic 7-5, 6-1 here on Thursday and take her place in the WTA Paris Open quarter-finals.After breaks of serve were exchanged three times in the first eight games, Bartoli broke for a 6-5 lead when Martic put a forehand long and took the first set when the stretching Croatian could only find the net with a forehand.Bartoli had served erratically in the first set, committing six double-faults, but Martic\'s challenge wilted in the second set and the 27-year-old second seed was able to close out a routine victory.Bartoli, who fell to China\'s Zheng Jie in the third round at the Australian Open, will now face Italy\'s Roberta Vinci after the seventh seed overcame a second-set slump to beat American qualifier Bethanie Mattek-Sands 6-3, 1-6, 6-3.A semi-finalist at last year\'s French Open, Bartoli is the last Frenchwoman left in the draw after Pauline Parmentier lost 6-3, 6-0 to 21-year-old German qualifier Mona Barthel.Earlier on Thursday, German ninth seed Angelique Kerber set up a last-eight encounter with top seed Maria Sharapova by beating Romania\'s Monica Niculescu 6-3, 4-6, 6-3.Sharapova, the world number three, swept into the quarter-finals with a straightforward 6-3, 6-1 defeat of South Africa\'s Chanelle Scheepers at the indoor tournament on Wednesday.