A fit and fresh looking Djokovic, who was beaten by Andy Murray to the All England Club crown, showed little signs of rust from a lack of recent match practice as he took just 56 minutes to advance on a warm Montreal evening.
The Serbian, renowned for his sense of humour and reputation as an entertainer, then celebrated his victory with some impromptu dancing in the centre of the main arena, much to the delight of the fans who had stayed late to watch him.
"It's the first game (for me) since Wimbledon, I had four weeks off ... but it was a great performance," a smiling Djokovic said in a courtside interview once he had ended his crowd-pleasing antics.
The return of the two-time defending champion after a month off had followed Nadal's first competitive match since his shock first round exit at Wimbledon.
It proved to be a successful, yet tense, one for Nadal as he and his doubles partner Pablo Andujar saved two match points before they beat Spanish compatriots David Ferrer and Feliciano Lopez 6-7(2) 6-1 12-10.