Shankar bagged the gold in boys high jump, while weightlifter Jamjang Deru won the boys 56kg category event before swimmer Supriya Mondal clinched a silver in boys 200m butterfly event on the opening day of the fifth edition of the Games being held at this Pacific island nation of Samoa.
With three medals today, India ended the day one of the Games at fifth position behind South Africa, Australia, England and New Zealand.
Sri Lanka's Roshan Ranatunge and Jamaican Lashane Wilson took the silver and bronze, respectively after clearing an identical height of 2.11m.
Considered a promising young talent, Shankar, who stands at six feet and four inches, won a bronze in the inaugural Asian Youth Athletics Championships in Doha in May and a gold medal in the World School Athletics Championships in Wuhan, China in June. He then finished a creditable eight in the IAAF World Youth Championships in Cali, Colombia in July.
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"I'm very proud to win a medal for my country. I have been preparing for this for the past two years," Deru said after winning the gold.
Later, swimmer Mondal bagged a silver in boys 200m butterfly event, clocking 2:01.94 to finish second behind Wilrich Coetzee of New Zealand (2:01.85). South African Brendan Levy took the bronze in 2:02.19.
India are being represented by 25 athletes in eight disciplines out the nine competed in the CYG.