DOHA, Qatar (AP) Serbia's Ana Ivanovic advanced to the second round of the Qatar Open on Monday when Carla Suarez Navarro withdrew midway through their match because of a back injury.

Ivanovic, the 2008 French Open champion, was leading 6-1, 4-1 when Suarez Navarro left the court.

Trailing 1-2 in the second set, Suarez Navarro had already sought courtside treatment from the WTA Tour medical team. The 23-year-old Spaniard then briefly left the court before resuming the set.

Ivanovic said after the match ``it is very unfortunate for her.''