* Scott seals victory with a closing 70 * Wins first title since Colonial in 2014 * Garcia shoots 71 to finish second (Adds detail, quotes) Feb 28 (Reuters) - Adam Scott maintained ice-cool composure over the tough closing stretch at the Honda Classic to end a title drought of nearly two years on Sunday, clinching his 12th PGA Tour victory by one shot at Palm Beach Gardens in Florida. The Australian world number 13 outduelled his Spanish playing competitor Sergio Garcia as he carded a level-par 70 in the final round in blustery conditions on the challenging PGA National layout. Tied for the lead with Garcia with eight holes to play, Scott played steadier golf down the stretch to post a nine-under total of 271 as the Spaniard's game unravelled. More...