RODERICK Staunton scaled new peaks of golfing excellence yesterday with an incredible 11-under-par 61 in the second round of the Japan Cup World Junior Championships. The Hong Kong schoolboy recorded one eagle, 10 birdies, six pars and a solitary bogey in a prodigious performance to leave his rivals trailing distantly in his wake. ''I played quite well,'' was Roderick's modest summation of a round which shattered the age group course record over the Fuji Country Club layout in Gifu by four shots. Added to his first-round 66, Roderick has a 36-hole total of 127 - 17 under par. Going into today's final round he has a 12-shot lead in the 10-and-under age group and is poised to become the first golfer from the territory to win a world championship at any level. Justin Ohye of America is second on 139 with his compatriot Matthew Rosenfeld, who beat Roderick by four shots to win last month's Optimist World Junior tournament in San Diego, in third place on 140. They are the only two players apart from Roderick to have broken 70, both shooting 69s yesterday. Such was the magnitude of Roderick's second-round effort that players in the elder age groups were forced to take a back seat as the Hong Kong youngster fielded questions from the Japanese media for half an hour. Playing from the yellow tees, giving a course measurement of 3,510 yards, Roderick brought the layout to its knees. Setting out from the 10th hole, Roderick had birdies at three of his first four holes. After dropping a shot at the par-three 14th, he added further birdies at the 16th and 17th to complete his first nine holes in four-under 32. The best, though, was yet to come as he took just 29 strokes on the inward half. In a six-hole stretch from the third to the eighth he was seven-under-par. For the second day in a row he had an eagle-three at the eighth - his 17th of the day - holing a 15-footer from just off the back of the green. ''My pitching and chipping was the strongest part of my game,'' said Roderick, who hit his drives close to the greens on many of the par fours and got down in two more. Roderick, who celebrated his 11th birthday less than three weeks ago, is being accompanied in Japan by his father, Hugh - one of Hong Kong's outstanding amateur golfers for more than 30 years and a former president of the Golf Association of Hong Kong. Staunton Snr said: ''It was a very good performance from Roderick and was certainly one of the best rounds I've seen him play.'' Last year, Roderick finished fourth in the 10-and-under section at Gifu with a 54-hole aggregate of 207, made up of rounds of 69, 72 and 66. The winning score on that occasion was 200.