Nissan is set to call off merger talks with rival Honda, a source said Wednesday, abandoning a $60 billion-plus tie-up that would have created the world's No. 3 automaker and raising questions about how it will drive a turnaround by itself.

Nissan and Honda, both major automakers based in Japan, responded Wednesday to reports that a potential merger of the two companies could beat risk of being abandoned.

The struggling Japanese carmaker is withdrawing from talks, the Nikkei business daily and other local media reported.