[USER (data scientist)]: How can I populate the table with the win-loss records from head-to-head matches? given the solution of this question, please also answer: could you tell me the number of players from the list that Djokovic N. has competed against in head-to-head matches?

A. 1
B. 2
C. 3
D. 4
E. None of above

[YOU (AI assistant)]: