Novak Djokovic has admitted that he will have to be at his best to beat "home hero" Andy Murray in the semi-finals of the Olympics on Friday.
The Serbian reached the last four with a comfortable win over Jo-Wilfried Tsonga on Thursday while Murray came through a similarly simple contest against Nicolas Almagro.
"Andy is the home hero," said Djokovic. "He has been playing better than ever on grass courts. I will have to be at the top of my game."
Djokovic has won two of his three meetings with Murray this year.
