Isner spearheads America to Davis Cup victory over Australia

John Isner powered the United States to victory over Australia in the Davis Cup World Group tie with a masterful serving performance at Kooyong on Sunday. The towering Isner served 49 aces in delivering a 6-4, 6-4, 5-7, 7-6 (7/4) victory over Australia's Bernard Tomic in two hours 15 minutes in the fourth rubber to clinch the tie with an unassailable 3-1 lead. It puts the Americans into the quarter-finals of the men's team competition with a home tie against either Belgium or Croatia and leaves