Istanbul -- Andrea Petkovic lost only five points in her final set Friday in locking up the final semifinal position at the Istanbul Cup tennis tournament in Turkey.
Petkovic, seeded sixth, defeated Elena Baltacha 6-4, 6-0. She won 24 of the 29 points needed to decide the second set after a seesaw first set that had a total of five service breaks.
No 3-seeded Anastasia Pavlyuchenkova also advanced to Saturday's semifinals in straight sets, taking out Sorana Cirstea 6-4, 6-2 with six service breaks over nine games.
Elena Vesnina was a 7-5, 6-1 quarterfinals winner over Anastasia Rodionova, winning 61 percent of the points in the match. She dropped only 12 points in the second set.