Djokovic wins first set of Wimbledon semi-final

Novak Djokovic makes a return against Juan Martin Del Potro at Wimbledon on Friday. Novak Djokovic won the first set of his Wimbledon semi-final 7-5 against Juan Martin del Potro on Friday. (AFP)

Novak Djokovic won the first set of his Wimbledon semi-final 7-5 against Juan Martin del Potro on Friday.

The winner will face either Andy Murray or Jerzy Janowicz in Sunday's final.