keywords: hewitt island commack horna lleyton
text: Hewitt Wins Long Island, Sends U.S. Open Warning  COMMACK, New York (Reuters) - Former world number one  Lleyton Hewitt hammered out a warning to his rivals for next  week's U.S. Open as he demolished Peru's Luis Horna 6-3, 6-1,  to win the Long Island Cup on Sunday.