Novak Djokovic battled through “an incredible fight” with Taylor Fritz on Saturday, shrugging off physical discomfort to win 6-4, 7-6 (8/6) and set up a blockbuster Shanghai Masters final with world number one Jannik Sinner.Earlier the Italian beat Tomas Machac 6-4, 7-5, ensuring in the process that he will finish the year at the top of the rankings.“I won’t be a favourite on the court, but hopefully I’ll be able to come out physically fresh enough to challenge him for what may be a long match,” said Djokovic of Sunday’s final.“I have to expect probably the toughest encounter of the tournament, and I have to be ready for it.”Sinner said playing Djokovic would make the final “even more special”.“It’s going to be a very tough one, it’s one of the biggest challenges we have in our sport,” he said.– Fighting spirit –Djokovic has now beaten the United States’ Fritz at each of their 10 encounters.The Serb broke the 26-year-old US Open finalist in the fifth game to win the first set in 38 minutes.But the second set lasted twice as long, and was a much more tense affair, as the players sent each other scrambling across the court in a series of thrilling rallies.The 24-time Grand Slam champion called it an “incredible fight”.“He could have easily won the second set… In the tiebreak it was really anyone’s game, (but) I feel like I was never giving up,” Djokovic said.In the second set, after an almost 13-minute fifth game eventually held by Fritz, Djokovic bent over in exhaustion, breathing heavily.The world number seven missed a good chance in the eighth game when he failed to convert a break point, with Djokovic recovering to hold.“I just never really came up with what I needed to come up with in a lot of big moments and the big