The 12-year-old Lucas followed his three-under 69 on day one with a two-under 70. His two-day score of five-under 139 handed him a commanding lead of 18 strokes at Jaypee Greens Golf Resort here.
On the par-five third hole, after a perfect drive of 260 yards into the middle of the fairway, Lucas pulled out a TaylorMade rescue club.
"I was actually nervous because there was a bunker to the right of the green, and water to the left. I aimed a bit right, the ball went really high, landed in the middle of the green, and just rolled into the hole. Only when my caddy starting clapping did I realize that the ball was in the hole!," he said.
India's boys took the honours in Category 'A', with Feroz Garewal and Tapendra Ghai sharing the lead.
Meanwhile, Ankita Kedlaya maintained hopes of victory in Category 'B' (girls), finishing the second day three shots behind Thai girl, Kanyalak Preedasutthijit.
Among others, South Africa's Cara Gorlei held on to top spot in Category 'A' (girls), and heads into the final day a shot ahead of Benyapa Niphatsophon of Thailand.
More From This Section
In Category 'B' (boys), Puwit Anupansuebsai, the 13-year-old prodigy from Thailand, fired a three-under 69 for a 36-hole total of level-par 144, two shots better than South Africa's Luca Filippi and 5 clear of India's Piyush Sangwan.
Thailand's juniors, in fact, dominated the second day at Jaypee: Kornkamal Sukaree led Category 'C' (girls) by a comfortable 11 shots, Nattabutara Unyamanee was ahead in Category 'D' (boys) by 13, and Unyamanee Wongaroon led by a whopping 19 strokes in Category 'D' (girls).
In Category 'E', Puneet Kaur Bajwa held on to the lead, and goes into the final round four clear of Hunar.