Li Na has described Agnieszka Radwanska as "a wall" following her victory over the Pole in the quarter-final of the Australian Open.
The Chinese reached her third Melbourne semi after winning 7-5 6-3 in one hour and 42 minutes on Rod Laver, but gave praise to her opponent following the match.
"She's a tough player," Li said.
"I was feeling today against a wall. She can hit everywhere, but without a mistake.
"You have to focus on every shot. Not every point, every shot."
The sixth seed will play the either Ekaterina Makarova or Maria Sharapova in the last four.
