Rafa, Roger closer to face off

Rafael Nadal and Roger Federer moved closer to a first-ever US Open meeting with second-round triumphs on Thursday while women's top seeds Serena Williams and Victoria Azaranka also advanced.
Spanish second seed Nadal, a 12-time Grand Slam winner who has nine titles since ending a seven-month injury layoff in February, beat Brazilian qualifier Rogerio Dutra Silva, 6-2, 6-1, 6-0 in 92 minutes at Arthur Ashe Stadium.
Swiss 17-time Grand Slam champion Federer, who at the seventh seed is in his lowest spot at the US Open since 2002, fired 37 winners in beating Argentina's 48th-ranked Carlos Berlocq, 6-3, 6-2, 6-1 after 95 minutes.
Federer, who swept the New York hardcourt crowns from 2004-2008, and Nadal, whose 2010 US Open title completed a career Grand Slam, could meet for the first time at the US Open in the quarter-finals.
On the women's side, defending champion Williams downed 77th-ranked Galina Voskoboeva 6-3, 6-0, and Belarus second seed Azarenka beat Canada's Aleksandra Wozniak 6-3, 6-1.
But Italian fourth seed Sara Errani made a tearful exit, the 2012 US Open semi-finalist and French Open runner-up falling to friend and compatriot Flavia Pennetta 6-3, 6-1.
Federer, 32, next faces Frenchman Adrian Mannarino, who defeated US 26th seed Sam Querrey, 7-6 (7/4), 7-6 (7/5), 6-7 (5/7), 6-4. Federer won both of their prior meetings, in the 2011 second round at Paris and Wimbledon.
Spanish fourth seed David Ferrer and French eighth seed Richard Gasquet kept rolling toward their own potential quarter-final by beating countrymen, Ferrer dispatching Roberto Bautista Agut 6-3, 6-7 (5/7), 6-1, 6-2 and Gasquet dumping Stephane Robert 6-3, 7-5, 7-5.