American Sam Querrey has equaled his best showing at a Grand Slam tournament by beating 14th-seeded Nicolas Almagro to reach the fourth round at the U.S. Open.

The 20th-seeded Querrey won 6-3, 6-4, 6-4 Sunday. He has made the fourth round at two straight majors. He also advanced to the fourth round of the 2008 U.S. Open.

Querrey will next face 25th-seeded Stanislas Wawrinka, who upset No. 4 Andy Murray.

Querrey had 19 aces and 42 winners.

Spain's Almagro has two titles this year, both on clay.