Hannah Green drained a remarkable 30-foot birdie putt at the final hole to win the HSBC Women's World Championship by a stroke in Singapore on Sunday . Boutier's five-under 67 put her in the clubhouse at 12-under par and for Green to draw level with birdies at the 16th and 17th . But Boutier completed a hat-trick of birdies over the closing holes to snatch victory .