KEY BISCAYNE, Fla. — Ana Ivanovic defeated French qualifier Pauline Parmentier 6-4, 6-3 in the first round at the Sony Ericsson Open.

The Serbian's win over the 106th-ranked Parmentier on Thursday ended her four match losing streak, the longest stretch of matches she's lost since turning professional in 2003.

The 58th-ranked Ivanovic dropped out of the Top 50 rankings this week. The former No. 1 and 2008 French Open champion has struggled with injuries since winning that lone Grand Slam title.

She had 15 winners, 31 unforced errors and seven double-faults against Parmentier. Her opponent had six winners and 23 unforced errors.

Ivanovic will play sixth-seeded Agnieszka Radwanska of Poland in the third round. Radwanska defeated Ekaterina Makarova of Russia 7-5, 6-0 in a second round match.