Morgan Smith, 19, of Westford defended her New England Women’s Amateur championship in Manchester, Conn.

Smith won by one shot over younger sister, Molly Smith, 18, after the final round. Morgan Smith, a recent Phillips Exeter Academy graduate, will golf at Georgetown University. She fired a final-round 72 to finish 3-under (213) for the 54-hole tournament.

Morgan Smith, a Vesper Country Club member, last year became the first teen-ager to win the event since Rhode Island’s Samantha Morrell accomplished the feat in 2010.

Molly Smith, who plays out of Mt. Pleasant Golf Club and is headed to Central Florida, led this year’s tournament after 36 holes after opening with rounds of 69 and 70. Lillian Guleserian of Blue Hill CC finished third with a 3-over 219.