Andy Murray has admitted that he faces an "extremely tough" semi-final against Novak Djokovic in the French Open after seeing off David Ferrer in the quarters.

The Briton said that he struggled to overcome the Spaniard after losing a match point in the third set of his 7-6(4) 6-2 5-7 6-1 victory, and he is expecting a sterner test against the world number one.

"I knew it was going to be an extremely tough match. The third set was tough to lose having match point. It's difficult to play another set when you have just lost match point," BBC Sport quotes him as saying.

"It's going to be an extremely tough match against Novak in the semi-final. I hope I can play high quality tennis. Obviously Novak has played very well today to win in straight sets against Rafa."

Djokovic reached the semis after defeating Rafael Nadal in straight sets in the last eight.