The Serb, 29, will retain his number one ranking - held for 122 weeks - if he reaches the final.
However, failure to do so would allow Murray to overtake him if the Scot can win the title, or if Murray reaches the final and Djokovic exits before the semis.
Ok, so crystal clear, the circumstances under which Murray can end the year as world number 1.
Question is my friends, will he do it ?