Nadal powers past Dodig
Second seed Rafael Nadal reached the fourth round of the US Open with a straight-sets win over Croatia's Ivan Dodig.
Nadal, the champion at Flushing Meadows in 2010, prevailed 6-4 6-3 6-3 in two hours and eight minutes to extend his unbeaten run on hard courts this year to 18 matches.
The Spaniard, who won the warm-up events in Montreal and Cincinnati, took a tight opening set in 42 minutes courtesy of a solitary break and was untroubled thereafter.
Nadal broke his 38th-ranked opponent twice in the second set and once more early in the third while remaining resolute on his own delivery. He has yet to drop serve in the tournament.
Dodig had won the pair's only previous meeting in Montreal in 2011 but had little answer to the steady stream of winners - 37 in all - coming from the other side of the net.
"I started the match with a high intensity. I lost to Ivan the last time we played in Montreal and he won two hard matches here against Fernando Verdasco, a lefty like me, and Nikolay Davydenko," said Nadal.
"I think I played my best match of the week so far today."
Next up for Nadal is a last-16 date with either 13th seed John Isner or 22nd seed Philipp Kohlschreiber. His old rival Roger Federer is a possible quarter-final opponent.
Nadal's countryman David Ferrer is also into the fourth round, the fourth seed defeating qualifier Mikhail Kukushkin 6-4 6-3 4-6 6-4.
And 10th seed Milos Raonic is a potential quarter-final opponent for Ferrer and he recovered from a break down to beat Spain's Feliciano Lopez 6-7 (4/7) 6-4 6-3 6-4.