Japan's leading jumps performer Oju Chosan completed back-to-wins and made it six win on the bounce with a comfortable victory in the Saturday’s Nakayama Grand Jump.

The six-year-old is only the second horse to win the famous race more than once after Australia's Karasi, who recorded a hat-trick between 2005 and 2007.

The hot favourite took command two jumps out to claim one of the world's richest prizes in jump racing, worth a total of 126 million yen (about $1.5 milion).

Oju Chosan came home three and a half lengths clear of outsider Sanrei Duke, with second favourite Up To Date – Japan's champion steeplechaser in 2015 – eight lengths back in third place.

“I’ve finally got used to the pressure of having to start as favourite and I was able to stay cool," said jockey Shinichi Ishigami.

"He was pretty keen to go early at the backside, but he still had plenty when Sanrei Duke came from behind us.

“He’s a smart horse and got into gear on his own when the runner-up came too close – I didn’t even have to use my whip so he’s a pretty amazing animal."