Tennis: Nadal vows to fight on after US Open shockThe 30-year-old Spaniard, the winner of 14 majors including two in New York, suffers a 6-1, 2-6, 6-4, 3-6, 7-6 (8/6) defeat to world number 25 Pouille in a four-hour last-16 epic.Mon Sep 05 2016