The 22-year-old netted again on the stroke of half-time with a powerful left-footed finish after Hyoran Kaue's assist.
Damjan Bohar scored the only goal for Slovenia in the 28th minute.
After dropping his serve to trail 6-5 behind in the first set of his fourth round match against Pablo Carreno Busta of Spain, Djokovic angrily smashed a ball in frustration, accidentally striking the line judge in the neck and causing her to fall to the ground.
In a statement, Fluminense did not disclose details of the move nor the name of the 20-year-old's new club, though widespread media reports in Brazil and Portugal said he had signed with Porto.
Concepts base on the league's general concept, leading to the earliest re-start of all European leagues.
The top 16 world-ranked male and top 16 world-ranked female players will participate in the ITTF Finals, with a cap of four players for every association.
This came after Barcelona insisted that he had to pay his 700 million-euro release clause to leave the club, while Messi argued that a clause in his contract meant he could leave for free.
In men's draw, second seed Dominic Thiem of Austria celebrated his 27th birthday by notching a comfortable 6-3, 6-3, 6-2 second-round victory over India's Sumit Nagal.
The event was held with strict safety rules in order to preserve the health of the runners, such as compulsory wearing of masks in the start and change zones, as well as the race center. There was a body temperature check before giving the start numbers.
"The truth is that for a while there has not been a project and there hasn't been anything. They have tried a juggling act and to paper over the cracks as things have happened," said Messi, who repeated his love for the club and insisted on his commitment in his final year at the Camp Nou. Enditem
Both matches will be played behind closed doors in line with health protocols due to the COVID-19 pandemic, local press said on Tuesday, quoting the Moroccan Football Federation.