Harmanpreet Singh scored a hat-trick to hand defending champions India a facile 4-1 victory over South Korea and end their round robin campaign on an unbeaten note at the Hero Asian Champions Trophy here.

Harmanpreet Wednesday opened the scoring for India in the fifth minute with a firm drag-flick and returned to score two more goals with rasping dragflicks in the 47th and 59th minutes to become the tournament's third player to score a treble.