Agnieszka Radwanska has said that she was pleased with her performance at the BNP Paribas Open, despite losing in the final on Sunday.

The 25-year-old struggled with a knee injury during her 6-2 6-1 defeat to Flavia Pennetta.

"It (the injury) actually happened a few days ago, but I didn't expect it was going to be much worse today," she told reporters. "I really tried everything I could to push myself and play 100% today, because this is the final, but unfortunately I was in too much pain.

"It's just the worst thing for a player to not be able to give 100% in the final of a big event.

"It was still a good two weeks for me. My first final here, a big event, and still a good result. Of course I will have a lot of treatment and do everything to be ready for Miami."

Radwanska is currently third in the WTA rankings.