John Isner fired 23 aces in a match that had no service breaks to beat Lu Yen-hsun of Taiwan 7-6 (4), 7-6 (7) in the final of the ATP's Heineken Open in Auckland, New Zealand, his last tuneup for next week's Australian Open.
Serena Williams did a quick little dance behind the baseline to remind herself to move her feet. After a complete air swing at the net in the second set, she smiled ruefully and drew in some long, deep breaths.
Ana Ivanovic began her bid for a third Generali Ladies title by defeating Yanina Wickmayer of Belgium 6-2, 6-4 on Tuesday. Sloane Stephens overcame a slow start to beat Magdalena Rybarikova of Slovakia 6-3, 6-1 in the first round.
Defending champion Andy Murray could face top-seeded Novak Djokovic only in the semifinals at the U.S. Open, while Rafael Nadal and Roger Federer -- who have never played each other at Flushing Meadows -- might meet in the quarterfinals.