NEW YORK — Al Horford made the go-ahead basket on a dunk with 19 seconds remaining, and the Atlanta Hawks beat the Brooklyn Nets 114-111 on Wednesday night to complete a season sweep. Playing without injured All-Star Paul Millsap and further short-handed after Pero Antic and Thabo Sefolosha were arrested early Wednesday and didn't play, the Hawks recovered after blowing a 12-point, fourth-quarter lead. Horford scored 24 points and Mike Scott had 20 points and eight rebounds for the Hawks.