World No.19 Emma Navarro advanced to her fifth semifinal of the season after he opponent, former No.1 Caroline Wozniacki had to retire with an injury in their quarterfinal clash in the Bad Homburg Open here on Thursday.  

Navarro trailed by a break in the opening set and served down 5-3 when Wozniacki slipped and fell on game point while chasing down a drop shot.