Sent into bat, Nepal first rode on batting heroics from Gyanendra Malla (48) and skipper Paras Khadka to post a competitive 149 for eight and then left-arm spinners Shakti Gauchan and Basant Regmi scalped three wickets apiece to bowl out Hong Kong for 69 runs.
Nepal will next play hosts Bangladesh in their crucial last Group A encounter here on Tuesday and the winner of that match will seal a place in the main round of World T20.
Against Hong Kong today, Nepal made a bright start to their innings after being put into bat with the opening duo of Subhash Khakure (22) and Sagar Pun (13) adding 36 runs for the first wicket.
After Khakure and Pun's dismissal in quick succession, Malla and captain Paras took the onus on themselves to guide Nepal innings and stitched crucial 80 runs off just 65 balls for the third wicket to set the platform the Himalayan nation.
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For Hong Kong, pacer Haseeb Amjad picked up three wickets for 25 runs, while left-arm orthodox picked up two wickets giving away 26 runs.
Chasing 150 for win, Hong Kong's innings never really got off as they lost wickets at regular intervals to be bowled out in 17 overs.
Only three Hong Kong batsmen -- Babar Hayat (20), Waqas Barkat (18) and Mark Chapman (13) -- managed double digit scores.
Regmi and Gauchan produced out fine left-arm spin bowling display and shared six wickets between them to rock Hong Kong's chase.