A bloodied Novak Djokovic has won the first set of the U.S. Open final against Roger Federer.
The top-ranked Djokovic was briefly rattled by a scary fall in the fourth game, but he settled down to take the set 6-4 on Sunday in a match that started more than three hours late because of rain. Federer looked tight, with an uncharacteristic 15 unforced errors.