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Ana Ivanovic beats Margarita Gasparyan to reach St. Petersburg quarters

ST. PETERSBURG, Russia -- Ana Ivanovic powered into the quarterfinals of the St. Petersburg Ladies Trophy as her Russian opponent, Margarita Gasparyan, crumbled on Wednesday.

Ivanovic, seeded fourth, was 2-0 down in the second set before winning the next six games to take the match 7-5, 6-2. Gasparyan had three break points on Ivanovic's serve at 2-2 but failed to take advantage, became frustrated and never recovered.

"I really had to dig deep," Ivanovic said. "I'm really happy with the way I played today, especially in my first match."

Ivanovic, who had a bye in the first round, will face either Russia's Elena Vesnina or Ukrainian Kateryna Kozlova in the quarterfinals.

Second-seeded Roberta Vinci secured her place in the quarterfinals by beating Belgium's Yanina Wickmayer 6-2, 7-6 (2). Vinci served for the match at 6-5 in the second set but was broken by Wickmayer, who proved unable to put up the same resistance in the following tiebreak.

The Italian's quarterfinal opponent will be ninth-seeded Monica Niculescu of Romania or unseeded Timea Babos of Hungary.

The seventh-seeded Kristina Mladenovic, of France, lost in the first round after a two-hour fight with Laura Siegemund of Germany.

Siegemund, who made the main draw as a lucky loser, took the initiative in the second set against Mladenovic to win 1-6, 7-5, 6-1.

Siegemund faces promising young Russian Darya Kasatkina in the second round after she beat Belgian Kirsten Flipkens 6-4, 5-7, 6-4.