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In fact, this result, combined with Jockovich's victory over Alexander Zverev of Germany, secured Serbia safely from one of the top two teams in the Gustavo Kuerten group, regardless of what happened on Friday the 3rd.
Croatia (5th seed) loses 6-7 (2/7) but is far superior to the giant Inner (Isner) (8th). 6-3, 6-4 followed by "Sets".
Isner's first set made Djokovic particularly pleased with the ability to prove he could win his fourth title in the final tournament of the season.
The world champion, Serbian, scored 6-4, 6-1 for young German players.
Djokovic, the eighth career, came to the tennis master "socks". The other vacancies are open, all depending on Friday results.
In London, Djokovic is already aiming for a sixth Masters dedication, equivalent to Roger Federer's record. The golden key to every outstanding title will end with age.
In six months, he reappeared in the top 20, ranking first, winning Grand Slam, Wimbledon and the US Open, as well as 1000 masters in Cincinnati and Shanghai.
He was also absent from the ATP final due to the injury of Rafael Nadal of Spain.
The tournament will continue with the Lleyton Hewitt group on Thursday, and Swiss Roger Federer will be in charge of Kevin Anderson and Kei Nishikori along with Austrian Dominic Thiem.