21-year-old Sangwan was dominant in all three rounds as he all three judges declared him clear winner.
He will now fight it out with New Zealand's Davis Nyika for a place in the semifinals on Tuesday.
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Manoj Kumar also booked a berth in quarterfinals of the the men's 64kg category with a 2-0 win over Canada's Arthur Biyarslanov.
Manoj next faces Briton Samuel Maxwell.