When asked if he thought about withdrawing, Djokovic told reporters after his quarter-final win over Robin Haase: "Yeah, I did, but I'm a professional and life goes on. I know that I cannot change anything now.
"Any time is the wrong time to receive that news. Today was a bit better, but still a lot of emotional ups and downs throughout the match. I got to the semi-finals, which is big result for me under the circumstances."
Djokovic will take on Tomas Berdych on Saturday for a place in the final.