Nadal reaches round of 16 at U.S. Open

Defending champion Rafael Nadal advanced to the fourth round at the U.S. Open on Sunday.

The second-seeded Nadal took down 2002 Wimbledon runner-up David Nalbandian 7-6 (7-5), 6-1, 7-5 at Arthur Ashe Stadium.

The story of the match was unforced errors, with Nalbandian committing 60. On the other hand, Nadal had just 18.

Nalbandian has lost nine straight matches against top-10 players.

Nadal next faces Luxembourg's Gilles Muller, who defeated Russian Igor Kunitsyn 6-1, 6-4, 6-4.

This is Muller's first time back at the U.S. Open since his quarterfinal run in 2008.

Spaniard David Ferrer, the No. 5 seed, beat 26th-seeded Florian Mayer of Germany 6-1, 6-2, 7-6 (7-2).

Andy Murray and Americans Andy Roddick and John Isner will also take the court on Sunday.