Dinesh beat his rival 19-7 to set up a tough clash against Russian Artur Beterbiev, a silver medallist in the previous World Championships in 2007.
However, Asian silver medallist Jai’s campaign came to an end after a 3-9 loss to German Eugen Burhard in the pre-quarters.
Dinesh was clinical against a short but spunky opponent, who troubled the Indian with some wild swings in the opening round.
But Dinesh soon took control and after closing the first round 3-2, he decimated his rival in the two rounds, picking eight points in each round.
On Tuesday, Olympic bronze medallist Vijender Singh (75kg) will take on Canadian Steve Rolls in his pre-quarterfinals.
Manpreet Singh proved no match for European champion Oleksander Usyk and lost his heavy weight (91kg) opener against the Ukrainian.
Published 07 September 2009, 18:45 IST