Neymar regularly made himself available and his neat passing in small spaces gave PSG several chances, his relationship with Cavani looking particularly promising.
Following his world-record €222 million move from Barcelona, Neymar will make his Paris Saint-Germain debut on Sunday after being named in the starting XI to face Guingamp.
The Brazil star took his place on the left-hand side of a front three alongside Cavani and Angel Di Maria and looked lively throughout against opponents who were happy to sit deep and defend in numbers until PSG found a breakthrough thanks to Jordan Ikoko's freaky own goal.
The Brazilian set up Edinson Cavani to make it 2-0, before the Uruguay global fed Neymar for his first goal in PSG colours.More news: USA tourist beaten for giving Hitler salute in Dresden, Germany
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Yannis Salibur went close for Guingamp, but the visitors were soon back on the front foot and it was no surprise when they took the lead - only how it came about.
With Unai Emery's side already leading 1-0 thanks to Jordan Ikoko's freaky own goal, Neymar assisted Edinson Cavani with a wonderful pass before the roles were reversed eight minutes from time for the Brazilian to tap home.
Monaco were in cruise control as Falcao (3 & 37) and Jemerson (22) put them 3-0 up before Wesley Said pulled one back for Dijon a minute prior to the break. Earlier, Lille were beaten 3-0 at promoted RC Strasbourg, conceding all three goals after striker Nicolas de Préville took over as goalkeeper following the sending off of Mike Maignan in the 63rd minute.