NEW YORK — Roberta Vinci reached the US Open quarterfinals for the second straight year, beating fellow Italian Camila Giorgi and the rain Monday. The 10th-seeded Vinci won 6-4, 6-2 in 67 minutes. Moments later, it started pouring, stopping all matches at Flushing Meadows. Vinci had never made a Grand Slam quarterfinal before this tournament a year ago. Now the 30-year-old has done it in two straight US Open trips. She lost to another countrywoman, doubles partner Sara Errani, in the quarters in 2012. On Sunday, American men's tennis slumped to an historic Grand Slam low as Novak Djokovic and Andy Murray remained on course for a blockbuster semifinal. Wildcard Tim Smyczek was America's last hope of avoiding the embarrassment of not having a man in the fourth round of the country's own Grand Slam for the first time in the Open era. But Spain's Marcel Granollers delivered the executioner's blow when he beat 109th-ranked Smyczek 6-4, 4-6, 0-6, 6-3, 7-5 to reach the last 16 and condemn the US to humiliation in a sport it once dominated. In an historic flop, no US man reached the fourth round of any of the year's four majors. The US Open wipeout came on the heels of no US man reaching the third round at Wimbledon for the first time since 1912 and it leaves Andy Roddick as their most recent Grand Slam champion when he won in New York in 2003. Djokovic, the reigning Australian Open champion and the US Open titlist in 2011, brushed aside world No. 95 Joao Sousa, the first Portuguese man to make the third round, 6-0, 6-2, 6-2 to make the last 16. Third-seeded defending champion Murray eased past Germany's world No. 49 Florian Mayer, 7-6 (7-2), 6-2, 6-2 while 2001 champion Lleyton Hewitt maintained his dream run with a 6-3, 7-6 (7-5), 6-1 win over Russia's Evgeny Donskoy. Hewitt will next face Russia's 21st seed Mikhail Youzhny, twice a semifinalist, who put out German 12th seed Tommy Haas 6-3, 6-2, 2-6, 6-3. Murray, the reigning Olympic and Wimbledon champion, will next face Uzbekistan's world No. 65 Denis Istomin, who put out Italian 20th seed Andreas Seppi, 6-3, 6-4, 2-6, 3-6, 6-1. Fifth seed Tomas Berdych of the Czech Republic and Swiss ninth seed Stanislas Wawrinka will clash for a spot in the quarterfinals. Berdych eased past French 31st seed Julien Benneteau, 6-0, 6-3, 6-2. Wawrinka got past unseeded Cypriot Marcos Baghdatis 6-3, 6-2, 6-7 (1-7), 7-6 (9-7). On the women's side, defending champion Serena Williams won her much-anticipated US Open showdown with Sloane Stephens while Li Na avenged a painful loss in Rome to join the world No. 1 in the last eight. Serena defeated US 15th seed Sloane Stephens 6-4, 6-1 to reach the quarterfinals, winning eight of the last nine game in avenging a loss that ousted her from the 2013 Australian Open. Williams booked a quarterfinal against Spanish 18th seed Carla Suarez Navarro, who upset German eighth seed Angelique Kerber 4-6, 6-3, 7-6 (7-3). Also booking a quarterfinal matchup were Chinese fifth seed Li, who beat Serbian ninth seed Jelena Jankovic 6-3, 6-0, and Russian 24th seed Ekaterina Makarova, who upset Polish third seed Agnieszka Radwanska 6-4, 6-4. — Agencies