Djokovic had a straight sets win over Del Potro winning 6-2, 7-6, 6-4. Ferrer beat Tipsarevic 6-3, 6-7, 2-6, 6-3, 7-6.
So the semi finals are:
Berdych (6) v Murray (3)
Ferrer (4) v Djokovic (1)
They will be played tomorrow.
It's the women's semis today.
First will be Victoria Azarenka (1) v Maria Sharapova (3)
followed by Serena Williams (4) v Sara Arrani (10)