Esteban Ocon has said that he does not look back with fondness on his past duels with Formula1 sensation Max Verstappen.

The pair have been wheel to wheel since their karting days, and Frenchman Ocon - to step up from Manor to Force India next year - says that it has always been intense with Verstappen.

"We fought hard all the time, like in F3," he told Dutch publication Formule 1.

Ocon, who is a year older than 19-year-old Verstappen, is referring to the 2014 championship won by the Frenchman.

"The battle was heavy and intense," he said. "I was usually quicker in qualifying, him in the race."

Asked if it was a pleasant battle, Ocon answered: "No it was not!

"It was often on the verge of dangerous. But we never crashed, so you can conclude that it was a hard but fair fight."

Ocon said that Verstappen is "a lot more aggressive" than him, explaining: "I mean, I'm aggressive when I really need to be, not all the time. I think first before I take aggressive risks.

"That the big difference between me and Max."

Asked if they respected each other during their battles, Ocon continued: "Not really. We hated each other during the season, but outside it was okay.

"But I think we have since become more mature."

Verstappen heads into the final race of the season in fifth place in the table, while Ocon has yet to pick up a point in 2016.