The dominant Serb eased past Zverev 6-2 6-1 for his 44th victory of a remarkable year which has seen the 31-year-old win Wimbledon, the Cincinnati Masters and US Open in recent months, after having elbow surgery in February. He squandered a first break point by firing a forehand into the net, but claimed the advantage on his second chance when his opponent shanked an terrible forehand long.
The 21-year-old fourth seed took his only break opportunity in both sets, hitting 23 winners and only 12 unforced errors in a supreme performance to maintain his 100 per cent record against Edmund.
The inaugural Davis Cup finals are slated for a week in Madrid in November 2019 as part of a revamp to the competition, but it has been contentious with players.
"But also I think and I hope that there will be a larger discussion between the players to understand how we are going to approach these two competitions".
Djokovic's win over Zverev and Federer's demise guaranteed Djokovic will move up from No. 3 to No. 2 in the world rankings on Monday, which has him swapping positions with Federer, but still trailing Rafael Nadal.
Djokovic, who has won the last two Grand Slams, at Wimbledon and the U.S. Open, is now world number three, but could move up a spot if he books a place in Sunday's final.
The 6-4, 6-4 victory over the 11th-seeded Briton seals Zverev's place in the season-ending ATP Finals in London next month, which bring together the top eight men. Zverev looked clueless out on the court, and soon faltered away as Djokovic broke serve for the fourth time in the match.
"He has improved a lot and he has established himself as a top player". The 37-year-old Federer is going for his third Shanghai title (2014, 2017) and looking to stay No. 2 in the ATP Rankings.
"I faced one [break point] today, and it was a set point", said Djokovic. Then I guess you come to a point when you just can't let it affect you, you just have to remind yourself how hard you had to work to actually get there.
"I think every year you feel more mature".