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Nadal vows to fight on despite injury fears

Rafael Nadal feels his fighting spirit can carry him through the second week of Wimbledon despite concerns over an ongoing knee problem.

The Spaniard received treatment on his right knee during his five-set victory over Germany's Philipp Petzschner in the third round. The second seed also came from two sets to one down in the previous round, and his knee problem has already forced him to withdraw from Spain's Davis Cup quarter-final against France as he plans a post- Wimbledon break.

Despite admitting he is a "little bit scared about the knee", the 2008 champion insists he will not drop out at SW19 as he prepares for his clash with Frenchman Paul-Henri Mathieu today.

"Emotionally I'm perfect," the 24-year-old said. "I fought a lot in the last two matches. I think I played very good tennis. Physically, I have a little bit of a problem on the right knee. But I've had time to recover."

Sixth seed Robin Soderling has emerged as an outside contender for the title after progressing to his meeting with ninth seed David Ferrer without dropping a set.

American Sam Querrey was set to face Andy Murray in the fourth round today and realises Centre Court spectators will be firmly in the Scotsman's corner.

"You hear them cheering for the other guy, and you assume they like the other guy," Querrey said. "They don't dislike you. They like both players. They just like him a little more."

In 2004, the then 17-year-old Maria Sharapova caused a sensation by crushing Serena Williams 6-1 6-4 in the final.

Today Serena and Sharapova have their first grass-court meeting since that occasion, but Sharapova attaches no significance to the result six years ago.

"There are always wonderful memories, but you have to start from scratch," said the Russian.