Former winners Andy Roddick and Venus Williams moved into the second round of US Open Tennis tournament at Flushing Medows, New York.Roddick, America's last men's major champion when he captured the 2003 US Open title, eased past compatriot and qualifier Rhyne Williams in straight sets by 6-3, 6-4, 6-4 .Fellow US veteran Williams, the 2000 and 2001 winner, also won an all-American match-up, beating wildcard Bethanie Mattek-Sands 6-3, 6-1.The 32-year-old next faces German sixth seed Angelique Kerber, who knocked her out of the Olympics.Wimbledon runner-up Agnieszka Radwnaska and former world number one Ana Ivanovic also breezed into the second round .