Men's second seed Rafael Nadal of Spain has reached the fourth round of the U.S. Open tennis tournament in New York. Nadal posted 7-6, 6-2, 6-1 victory Sunday against Jo-Wilfried Tsonga of France.

The Spaniard will next play 15th-seeded compatriot David Ferrer, who was stretched to five sets before advancing past David Nalbandian of Argentina, 6-3, 3-6, 4-6, 7-6, 7-5

In another five-set marathon, Juan Ignacio Chela of Argentina, seeded 20th, upended 12th-seeded Croatian Ivan Ljubicic, 6-4, 6-7, 2-6, 6-3, 6-3. Juan Monaco of Argentina had an easier win over compatriot Agustin Calleri, 7-6, 6-2, 6-4.

Among the women, American Serena Williams has reached the quarterfinal round. The eighth seeded Williams posted a relatively easy 6-3, 6-4 victory over 10th seeded Frenchwoman Marion Bartoli.

After Serena won, her older sister Venus Williams also advanced. The 12th-seeded Venus upset number five Ana Ivanovic of Serbia, 6-4, 6-2.

Some information for this report was provided by AFP and Reuters.